The dropouts should atleast be perfectly horizontal - as apposed to what you've drawn, looks like they point down which is random. Needs a 'built in'/intergrated booster. Thicker tubing (= bigger weld areas). Pointless little tubes on the seat post. That area would be better if it looked more like the 04 Zoo's, Onza Zoot, Ozonys Canibal deisgn; where there are three tubes all branching outwards from the BB area upwards. Perhaps have longer gussets to spread the stress out more? Finally, the chainstay tubes shouldn't just weld onto the BB, a yoke of some sort should be in place for a stronger area.