Rather nice fit, no free slots or tonnage. Customisation can come from the half ton of LBX10 ammo and/or engine: switch to SRM ammo (200 is a little tight for 12 srms) switch it out for a full ton, and shave a little armour of the arms and legs (or vice versa, getting rid of the ammo and adding armour) can upgrade or downgrade the engine, each 5 points give's you a ton, but since there's no free slots putting that to good use might be tricky You can heavily downgrade the engine and get rid of FF to open up a few options, but with a brawler such as this that speed loss might prove too much of a negative.