I was just reminiscing.
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Found your deck while looking at how others use goblin welder. I think you could really take advantage of having 4x in this deck. One of the strategies I've worked out pretty well involves the welder. If you've drawn him, a great furnace, and bosh on your first draw... Opt to have your oppenent go first. Draw a card on your first turn, but don't play anything. Discard the bosh. On your second turn, lay the great furnace, then bring out the welder. On your third turn you can swap the great furnace and bring bosh into play. Most people won't be able to compete with that creature for creature. And most people can't do much to stop the process that quickly. Most. I prefer a phyrexian colossus because there's a low chance an opponent has 3 creatures out by now, thus making it unblockable. And if they do, those creatures are going to die. The welder also bypasses the untapping cost of the colossus. Throw an instill energy on either one of those creatures, and it's game time. Either way... I love the goblin welder.
I've always loved ornithopters and memnites. Not relevant to your deck, but they remind of the days when I would have 4 of each, as well as 4 dryad arbors in a deck with a few protean hulks and 4 essence wardens and 4 soul wardens. Good times!