I built my MB-6582 last year, so relatively recently...
In the process I pieced together a few handy references that helped me with my build...
Good luck with yours...
Planning the cost of a build, based on various component options:
PCB Sets are still available here:
https://modularaddict.com/shop-by-brand/midibox-ucapps-de
Nice pre-made Aluminum panel sets available here:
http://thebeast.co.uk/?product_cat=midibox
As a bargain basement alternative to aluminum, you could have panels fabricated as if they were PCBs, which saves a ton:
If real SIDs are too difficult to find and/or too expensive, take a look at the best clone options:
How to program your Microcontrollers:
...Or just buy some pre-programmed chips:
Where to get the "Just Right" power switch:
Which SID filter capacitors to use:
A useful voltage testing guide:
There are many power supply options available, but this one is by far the easiest:
THE definitive guide for making the control surface:
A nice little PCB that simplifies Char LCD Wiring:
A useful way to join the boards together:
Optional Encoder Backlighting: