I bought one like that in southern Scotland once and got a grant to restore it, so got a local builder in to do it all and sold it right away. It made more sense at the time otherwise I may have been able to advise you. Just a quick note about listing, they won't list it if the structure has changed substantially from original
Is it listed already? Try to avoid it if possible, costs go up massively if it is plus changing anything is a nightmare!