Hi, it´s a pretty easy thing to build, even if you don´t have much diy experience. All you need is a Core Module (here), a couple of lcds and some ribbon cable. There really is not much to understand. You could also take a look here at the different display options. 2 2x40 character displays are fine, but there are other options which (in my own opinion) would be a better fit.
On that topic in the Reaper forum you posted is another guy who used 8 small ssd1306 displays (a little more down) which would fit exactly above the faders of the bcf2000.
If you need any help, we have a very nice and very helpful community here.
Just to give you a little jump start:
You will need:
- 1 Core PCB (available at SmashTV) ~8€
- 1 LPC1769 LPCXpresso Board (available at Watterott) ~24€
- 2 2x40 character displays (available at eBay) ~10€/p
- a small collection of electronic parts (complete list here) ~20€
- SD or Micro SD Card
Prices depend on your location of course.
Think about it.
my regards