The ISA/PC104 backplane is quite expensive for build a compact DOS computer. It is almost impossible to find ISA bakcplane for less than $40, and it is almost impossible to find PC-104 to ISA for less than $100 on aliexpress.

Just confirmed with Zhblue this expansion board can use ISA8-EXP-01 as regular ISA backplane

I also found the Book8088's ISA socket are almost same to (mirrored) PC-104 pinout, is it possible to connect it to PC-104 card just use a ribbon?