Hi Jan,
CAD is easy to adjust dimensions. About one mouse click, then type in new numbers. But I can't read your mind, or be positively sure about your description either. If I try to go by your words only, I could build something not even close to what you want, wasting my time. And after you build things in CAD it's not hard to change features, but time consuming. If the CAD model is mostly, flat, square, rectangular, round or other normal geometric shapes, it's fairly easy. But, if you want a freeform shape - that- is very difficult. FOr example, if you pick up a large boulder, and tell me to model it, that would be almost impossible to do unless you had a lot of time and special measuring equipment. Things like hands or faces would be very difficult.
Gotta run. I hope this helps....
Sent from Dan's iPhone, please disregard typo's. 😜