i am unfamiliar with the printer and parts you are talking about, and am not sure which CAD program you use, so this may be irrelevant - i apologize if so, but the question is vague enough to warrant at least a little help if i can give it.

i use openscad for cad modelling. multiple files can be imported there and moved around. little pieces can be added between them if you require more attachment points than what is available (like if its connecting two roundy bits, etc).

what do you foresee as a problem with combining these two things in CAD?