Have you seen Mycosynth Golem?

Also check out Coretapper, Red Mana Battery, Lux Cannon, Blightsteel Colossus + Burning Anger, or Grafted Exoskeleton + Bosh, Iron Golem. If you decide to go with some infect, Decimator Web, Throne of Geth, and Contagion Engine are good.

Also, Liquimetal Coating/Mycosynth Lattice + Aladdin is a fun combo

Since you said you're not really an EDH player, I'll give you a few general tips first.

1) Mana: not as important in a mono-colour deck, but I think you have too much in this deck. 41 lands is a lot, even for a green deck, and you have lots of mana rocks. My feldon deck runs 35 lands and about 9 mana rocks. You're playing an artifact based commander, so artifacts are usually better than lands.

2) Draw: EDH games go long, and if you can't draw cards, you're a sitting duck. Unfortunately, red is really bad at this, but we can make good use of wheel, rummage, or loot effects. Dragon Mage is a wheel of fortune on a stick and can be reanimated with feldon, Wheel of Fate and Wheel of Fortune are house cards in a build like this, but Wheel of Fortune is definitely more difficult to acquire. Good sorceries to include are Faithless Looting and Tormenting Voice since they draw cards and fill our graveyards, and this makes Feldon very happy. Culling Dais and Phyrexian Vault could also be considered as a way to get more value out of the tokens that feldon makes, which leads me to my next point.

3) Sac outlets: Getting increased value out of feldon's tokens puts you over the top. Helm of Possession is great value in this case, and toss in Krark-Clan Ironworks and Ashnod's Altar to generate more mana off of the tokens to fuel your threats. Sac outlets allow you to leverage as much out your commander as possible.

4) Fun tech: Are you playing toolbox, combo, or reanimator? The archetype will affect what the rest of the deck is filled with. reanimator strategies can really benefit from Sundial of the Infinite because you use it when the tokens are triggered to sacrifice and exile the trigger from the stack, allowing you to keep the tokens. Untapping and using feldon multiple times in a turn helps all of these strategies, so Thousand-Year Elixir and Thornbite Staff can be a huge boon.

5) Board wipes: EDH is a format defined by board wipes. Inevitably, one person will be pulling ahead in creature count, and you need some way to bring them back down and reset the board. Blasphemous Act and Starstorm are probably your best bets in red. Nevinyrral's Disk is another very common colourless board wipe, but I don't run it because I need a lot of my artifacts.

With these in mind, think about how you want the deck to work. Find a direction you want to go and stick with it and cut the chaff that doesn't really contribute to your gameplan if you want to make your deck more powerful. It's hard to get redundancy in a 100 card singleton format, but that's what inspires creative deck-building.

My Grenzo list, Dancing Dirty, is heavy on artifact creatures if you'd like to see a bit more of a toolbox build.

Your deck has very few creatures that can benefit from Feldon's ability, this seems much more of a generic artifact deck. If you plan on using Feldon, you'll want more creatures who have ETB and LTB triggers on them.

You also have some subpar cards. I would recommend cutting these, and also cut your land count down to 38.

Altar of the Brood does nothing for you. It's only useful in a combo deck, and is otherwise worthless unless you really want to mess with their scrying.

Golem's Heart does very little. You have a lot of life, so I would recommend using cards that let you do things rather than just gain you a couple points of life.

Alloy Myr is ok, but a typical mana rock like Darksteel Ingot is superior.

Darksteel Myr and Darksteel Sentinel are simply underwhelming, and only seem to be in here due to their indestructibility. I would recommend to have valuable creatures who help you win the game, rather than having bad creatures that won't die.

Hovermyr does very little. Don't use him.

And now for some cool artifact replacements.

Burnished Hart is a great artifact ramp card, and it is recurable by Feldon

Clone Shell lets you dig through your deck and find wonderful cards. Very useful.

Duplicant is great artifact removal.

Precursor Golem brings along some buddies, and is a great Feldon target.

Finally, all Feldon players should consider Sundial of the Infinite. It is a great card, and it allows us to keep our tokens without them dying. Very handy.

Hovermyr is a great place to stick equipment or arcbound counters, but it is a pretty low powered creature on it's own.

I'm not convinced Bottle Gnomes is worthwhile. While life gain is a thing red doesn't really do, it's also something I don't think you need.

Serum Tank can be ok as a way to gain some card advantage if you're looking to draw some cards. Faithless Looting is also really good in this deck.

You should run the Scrap Mastery that came with the deck. It's quite good.

Triskelion is another creature you may want to look at. It's a great place to put those +1 counters, and three damage at instant speed can be really useful.