Well for one I'm still not sure what you are looking to do. Are you gonna just go with an LST roller and build it with hop up parts, or just buy stock parts and build it that way??? I dont know. Or are you gonna buid something custom? And that depends on what your definition of custom is. Recently I have put like $2G into my LST2 and you cant barely tell unless you look really closely and know what you are looking at. I should have just built it from the ground up with hop up parts, but you still have to buy stock parts at some point. As far as buying a tranny and all that stuff, you can buy them from horizon or another online store, but your best bet is gonna be ebay. Look for the LST2 chopshops on there.