That's our plan but we keep getting sidetracked for various reasons on the Spanish med.
We picked up a small sail catamaran
(Catalac 10m) with the idea we can pull the mast
and the 3' draft
and 15' beam should work
fine most of the canal
Costs appear to be pretty cheap
. If you just moor on the side of the canal cheap to free. If you need facilities there are some marinas
and they don't appear to be too badly priced.
You do need a CENVI certification
at least for the French Canals.