I realize there is a place to enter the information in PACKING/OTHER for shipping dims but this is easily missed when adding the fastener. If it were in inventory it could automatically account for it upon selection.
Would you provide more information?
Is the end goal to indicate how many inches/millimeters to the outside dimension of the crate when a particular fastener is used?
Example: Look at the Collar field in Designs>>Other.
Actually now that I have thought about this a little more I realize that just having a thickness would not work as if you have more than one (say link lock) on the same plane it would keep increasing the thickness.
I think now just having the ability in the Design/Packing/Other list to enter the increase in dims is good but it might be good to have some kind of reminder or something to make sure that I don't miss entering an outside dim increase. Might be my age...but I forget...
This is a common way this is handled: It looks like you're already doing most of the steps but there might be some additional information.