That depends on how large the workshop will be, if it is 1ft x 1ft x 1ft, and the blocks are 6in x 6in x 1in, then 4 blocks per wall and 4 walls gives 16 blocks.
I think perhaps 2250 blocks .
Six and one-half blocks.
It all depends on which workshop you are in
64 of them.
You need 8 cubic blocks of sides 0.5 inches to make a 1 inch block.