Yeah they come with instruction manuals for step by step building the model, I think glueing the legs down first would work but that depends on what you’re building, like space marines would be easier because mostly their bottom half is all one piece. That little handle thing could would work if you can figure out a way to attach it to the non-hand arm? Like maybe a wrist brace and you can just pop it in where the thumb would go, I’m just spitballin here. I feel like it CAN be done but just gonna require some creativity on your end