Wow! Very cool conversions- I love the "typhoon" rokkits!
Personally I feel a models base should provide context for a model so the junkyard theme is inspired! Having said that, I can't help feel the downed bommer base would be better suited to a stormraven sized mini as its currently the first thing your eye is drawn too, rather than the (awesome) speeder.
As ever your work remains a constant source of inspiration.
Keep it up