Now that it's stripped of all accoutrements, we can ID this logic board's silicon:

Intel LGA 1151 CPU socket

AMD Radeon Pro 555 GPU

SK hynix H5GC4H24AJR-ROC 4 GB GDDR5 2400 MHz SDRAM (4 GB × 4 for a total of 2 GB VRAM)

Broadcom BCM5776 Gigabit Ethernet controller

Texas Instruments CD3215C00 (also seen recently in the 15" MacBook Pro) USB type-C controller

Intel SR2C9 platform controller hub