Looks great! I especially like the source window (although the 2nd parts-bin also looks useful).
Regarding the source window, I'd like it to behave a bit like in MLCad. When I make instructions, I build the model in LDCad and then I open it in MLCad to reorganize all steps. Because, with such a source window, it's easy to see the order of the parts and being able to move whole steps back and forth. I'd really like that, being able to move the order of the parts directly in the source window.
Regarding the source window, I'd like it to behave a bit like in MLCad. When I make instructions, I build the model in LDCad and then I open it in MLCad to reorganize all steps. Because, with such a source window, it's easy to see the order of the parts and being able to move whole steps back and forth. I'd really like that, being able to move the order of the parts directly in the source window.