Getting the PCB's and building a the boards from scratch might be an ambitious task this late in the game. This proves to be extra challenging, as many of the parts needed to complete an express and others are backordered until after new year from Mouser.
You have posted in the right spot, maybe someone will have some left over completed boards they would be willing to part with, but I would go that route, in getting fully assembled boards, at least for this year.
-Wesley