I think I'm ok with the goblin bases now. I ended up with all 20mm bases, but since its pretty easy to slice them off I may revisit the 40mm base thing in the future. I've done them up right now for 8 wide, but I'm going to make sure that its easy enough to do 6 wide. I'll number the bottom of the bases when I put magnets on them and make up a magnetized movement tray.
Next up: Spear Chukkas. I actually have three of these puppys laying around, but I'm only going to do two for now. I'm probably going to use the wood technique that GW posted for the new skaven screaming bell painting article, so we'll see how that looks for this.