Sword rack specs

[JeffS]

Bit of an odd question, but does anyone have a tested profile shape I can use for a custom sword rack? Many of the ones I see online are for Japanese swords and I'm concerned they would not accommodate differing shapes/widths per a broad ethnographic collection. The top photo is what I've been using, it is actually a silk spool holder used for Khmer ikat weaving. I find it works well for narrower blades but wide blades like a Kachin tool dao won't sit right, in fact the Lepcha ban in the photo just barely seats without tipping forward. I've also attached a random internet grab of a sword rack as reference. I can certainly come up with a profile by eyeball but I'm curious if someone here may have played around with different designs and have a profile they recommend.