I did a bit of a hack on the outline tool in BoardOff so that it instead of being limited to the symmetrical outlines of twin tip you can draw asymmetrical outlines for surfboards and mutants. You need to design the nose and tail as separate templates and there is a new button 'combine templates' that then stitches them together. Below is a quick example. I know nothing about surfboard design but now have some motivation to find out.
The recent update in the length to 180cm should be enough for surfboards and mutants but raceboards would be longer again! Doh.
The last thing needed to finish the part of Board off is some additional control over the fins which will no longer be parallel and need to be able to have 2,3 and 4 fins options.
This feature will be in 1.13.16 that will go up in the next couple of days.