I'm planning to build a simple cockpit for my DCS A-10 obsession

I got me a TM Warthog, TM Cougar MFDs, and a Saitek rudder pedals. I'm planning to hit a junkshop for an old car seat and get some boards from the local B&Q and make me a simple 'pit. Having appreciated the TM Cougar MFDs and the switches on my TM Warthog throttle, I now want to make a couple of panels for my 'pit as well. I'm hoping to build an AHCP, UFC, CDU, Electrical panel, and maybe a few other panels as well. Right off the bat, the UFC and CDU alone will pose a challenge simply by the sheer number of buttons I'll be needing.

At the moment, my research has led me to a few options:
1. Leo Bodnar's BU0836X - I understand this offers 32 buttons, plus a 8-way POV (which can easily be make into 8 more buttons). I'm not sure if I can use the rotaris/analog axii though.
2. GGG's GP-Wiz 40 MAX - Again, 40 buttons plus a rotary or two.
3. Ultimarc's i-PAC4 - 56 inputs!

Has anyone had experience with any of these? Or maybe with something else I've not heard of? The CDU/AAP panel alone will be 8 LSKs + 6 FSKs + 10 numbers + 26 letters + 9 misc buttons/rockers = at least 59 buttons!!

So I guess I'm looking at more than one board right off the bat!

Cheers!