Dave – good to hear that progress is being made on the workshop so that modelling can recommence.
As long as the window cills aren't too low you can still use kitchen base units – just put a decent backing on where they pass the windows or span the worktop between units at a lower level where it passes the windows.
No doubt you've got it all sussed though.
Just looking at sheds as the existing one is past its sell by date – going a bit larger to give room for spraying.
Chris