Does anybody have a formula for these 2 drawer front subassembly dimensions? We want the holes to be 1 3/8 from the bottom and side of the drawer box, not the drawer front. I feel this would be a complicated formula to figure out and I'm not even sure what the best practice to figuring out the exact location is. I suppose I could draw a plan section for each and then measure but I need this to be a formula in case we use different slides with different clearance gaps. Is this setup better in Foundation?