I've settled for a 100 amp. 24 circuit main breaker panel for the first building ( smallest one that's seems available in my area, without ordering), even though it is a little "over kill",and a 6/12 circuit "main lug" panel for the 2nd bldg.
The 2nd bldg. is smaller than the first (approx. 8x10). The first bldg. is probably 10x12. Customer accepted my price, now comes the fun part smile Actual work. Though sometimes I think it's easier than figuring up the job
(lots of headaches).