Ordered an interesting bundle today:
- PC Chips M321 motherboard rev 2.6;
- TX486DLC CPU with J38700DX SuperMath copro;

- Aztech Sound Galaxy Pro 16 II (I think);

- some Trident VGA card;

- some sort of ISA NIC card.

- some noname multi I/O

The main thing is the motherboard, of course. I decided that I want a dedicated 386 build after all, but it needs to use an Intel 386DX33 CPU, because it's THE 386 chip for me. I have the CPU and the FPU, but finding a motherboard for them turned out to be tricky. I also wanted to have L2 cache.
For some reason, most 386 boards I could find in Russia were cheap later models with surface-mounted AMD 386DX40 chips or 386SX ones. Some still had a CPU socket or simply a jumper for setting an FSB, but AFAIK those can get issues with "external" CPUs.
I know PC Chips gets a bad rep, but it's probably the most popular "true" 386 board I could find. So I just picked the one in the best condition and with most stuff bundled.
The plan is to equip the board with my Acumos AVGA2 card, a SoundBlaster Pro 2 and an MPU controller for MT-32.