I've trying to figure out the best deal. I bought a B4.1 as a rtr. Since then I've upgraded the front brace, Avid rack, turn buckles, ball cups, battery strap, and ball diff. To get it closer to a Worlds, I still need a longer chassis, shocks and hubs. Would I b better off just buying a Worlds for 250 and sell mine or keep upgrading? Thx