I had to say that of course
As marcus said- grommets and line work and you can set it up with adjustable degrees of slack. Put a grommet near the front cross bar and one a few inches in front of back lacing, then put two pairs of two grommets about 4 inches apart with these pairs evenly spaced on the tramp from front to back- then just lace a 3/8's line through them. The only problem is that line is tough on bare ankles.
If you use webbing, there is no easy answer to how much slack is needed to make getting your feet under it easier (I don't think) but there is a secret to stitching it down that I learned from my local cobbler/tent/saddle repair guy: at each sewn area sew an X with the long
sides attached, corner to corner with stitching. do not "box" your stitch in with thread across the width of the webbing. Stitching across the width of the webbing actually creates a weak area that rips more easily. Using the open-ended x pattern spreads the stress more evenly. True that.
Good luck- get a good sailor's palm and heavy needle set and go for it!
Heat wave today here 30 deg and rainy. I can't boat and I can't ski- look for me to spend more time here I guess.