First off, nice pictures and welcome to Maadis. Your lower Handguard is East German I believe. The Tapco stuff is a mixed bag: some people hate it, others love it. I've got a SAW grip on my Maadi RML, mainly because I had one and needed the US part, but it feels pretty good in my hands. It would be a straight swap for the Buttstock, you'd just need to drill holes in the Tapco Folder (included in the instructions). I've heard some not so positive remarks about the Galil folder, and I had one for a while. To me it seems kind of flimsy, and I don't really know if you'd get much extra length out of the trade. Just some thoughts from a fellow Maadi owner (I've got two and love both). Stay around and enjoy. There's tons of stuff in here.
BTW--What are your compliance parts?