I'm pretty excited about this one so wanted to give it a build thread. Here's an NEC PC-8801mkIIMR I recently acquired from a listing that literally only said "PC-8801mkIIMR personal computer" with nothing about whether it was working, how it's been stored, etc. But the photos looked promising and it also came with the keyboard and a trove of the original materials for it. As mentioned in another thread, I'm usually pretty wary of going for things where there's a lot of unknowns. But as an enthusiast of all things retro Japan I couldn't pass up on it from what I could see of the external condition.

Specs:
4MHz NEC μPD780C-1 CPU (Zilog Z80A based)
RAM: 192KB
VRAM: 48KB
Sound: Yamaha YM2203C
2x TEAC 5.25'' FD-55GFV-40-Us

Currently awaiting a monitor with digital RGB from Japan so it might be a couple of weeks before first boot, but I wanted to start opening it up to check up on the internals. So far, it's fairly immaculate. The battery is starting to corrode of course, but thankfully it's not bad at all. All the caps looks great, even the power supply is just as in good visual condition. I didn't even dust it. The board is so nice!