1. What material is the HHKB pro 2 made of? I am wondering if you can dye it
ABS, it can not be dyed very easily, get it painted
2. How easy it to give it a custom spray paint job and has anyone done it before
I'd get someone else to do it, painting all of it is tricky as the HHKB is case mounted so you'd have to fully disassemble it and make sure the paint doesn't interfere with sliders
3. Any ideas on how to color the case
Vinyl wrap it if you can be bothered
4. Topre switches - are they worth it,
Yes, but I prefer BKE redux
5. Which are the best sliders which have MX mounts that are still in production and should I get silencing rings
Novatouch sliders or KBD Fans adapt x, I never use topre without silencing rings
6. Are they worth it?
Buy one and you'll see for yourself