make sure the turning radius is ok too. you can't just be like "i want it kinda fatty here, and maybe tapered a little in the tail, and i want a ski that's 100 underfoot". those numbers might sound rad when you just through them out there, just be careful that you dont get some nutty radius, which prolly would happen more often than not if ppl just started making their "dream dimensions". even real small changes in running surface or difference in symmetry, etc. can impact it hugely. id just check the numbers before actually making the skis. im sure they'll work out and be sweet. good luck and way to go. i don't think its a waste of time as long as you do a good job. and you'll learn so much about like everything, not just skis, though youll definitely know a thing or two about those.