That's too bad. Can't say I agree....(No sanding or modifications other than paint.)
I you don't mind me making a suggestion, it looks as if your separated figures are the standing versions of the figures you also used to do, but cut diagonally at the limbs. This diagonal cut makes it even more difficult to get them into a seated position than modifying a figure already in a seated pose. Might I suggest a ball and socket system, similar to what you used on the elbows of your C3P0 figure? Or maybe use the seated forms to cut into components instead of the standing forms?
Otherwise, any way I could coax a seated Chewbacca out of retirement? Thank you! You do great work!