Hello Mike,
Although by no means are they gospel, here are some dimensions that work pretty well.
I think that the space between the rim and deck and the lip width are most critical - 3/4" allows most all spray skirts (bungee knot included) to fit underneath and a lip that is at least 3/4" wide tends to hold the skirt in place a bit better than one that is narrower. Another consideration is the sharpness of the lip edge - the sharper it is, the better it will prevent the skirt from popping off unexpectedly (however it is easier to damage as well so there is a trade off here).

Joe
Redfish Kayaks
: Group

: Can anyone give me the minimums and maximums that you would make these
: dimensions?