Answers

Painting over thermo foil will not be a long term solution. It is a smooth non-porus material. Your best bet is to replace the doors. There are lots of options today that weren't available a few years back. If you want to paint, you can order raw mdf doors and have them painted to match the cabinets.

Yes you can get custom closets installed without breaking the bank. Basic orgnaizing systems designed and installed by a closet organizing specialist will utilize all of the space in the closet, increase the amount of hanging space and will be built using quality materials. In my research, I have found that our proffssionallly designed and installed closet systems are about double the cost of what it would cost you for a system at the DIY box store BUT, with our system not only do we do all the work and guarantee it for a lifetime , the quality of the materials are far superionr to the junk they sell at the big box sotres. The design is a huge part, and I will put my  qualified designers against any help that you might get at the big box sotre. Things that affect pricing are the size of the closet, number of drawers in the system and how detailed we get with accessories. Prices for a medium sized walkin closet can very greatly, you can see some examples on my website here: http://www.closet-doctor.com/closet/classic/closet-organizer-system