I finished my early 17th century petticoat this morning! It's done! And I even have pictures.
The whole thing is hand-sewn - I even finally put my sewing machine away after it had sat unused on the dining room table for a couple of weeks. I don't know whether I'll do the jacket entirely by hand, but so far I'm feeling virtuous. (Yes, I always feel like I cheat when I machine-sew pre-1860 stuff, but I do it anyway so long as it doesn't show and the stitching isn't supposed to show.)
It's light green wool interlined in the bodice with layers of cotton twill and lined with muslin, and the skirt is lined with peach linen. I guess I should have taken a picture of that part, but I didn't think of it until after I had taken it off. It's basically constructed along the lines given by
reine_de_coudre in her recent post on petticoats and the information from the links she gave there and The Tudor Tailor. It is completely unboned and so far seems reasonably supportive.
While neither the wool nor the linen is a heavy weight, the petticoat is fairly weighty. The bodice magically makes the weight go away and it doesn't feel heavy at all while being worn. There's another point in favor of the built-in bodies (or for separate boned bodies, having the petticoat pointed to the bodies).