There was at least one Traveller/Countryman cut down by Neville Trickett (The Man) in the sixties.
This photo doesn't really do it justice, but they look quite good.
Cut lines around the front are the same as for a normal Sprint. You will find a few details in some of the threads on the
(old) Mk1 Conversions forum. Mark Forster who runs the forum recently had Neville Trickett cut down a sedan for him and he gave some hints (although its Neville's trade secret) about how its done. Just cutting the shell isn't enough, there are a million other small parts that need doing too.
Tim
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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian