Terry Smith's prototype “Marcos Evolution XP” shows his ideas of how a mid engined version of the Marcos GT could look.
Terry says "I have used the central driver layout with a passenger either side which was proposed by Dennis and Peter Adams in the 1962 Adams XP prototype. You will also see my Speedex Silverstone shell, which was of course the forerunner of the first Marcos model."
More information from Circa Cars
And his ideas on how an updated Adams Probe might also look!