I am building my own shaker doors for our kitchen remodel which we are using Ikea boxes for. The only door i have left is the double hinged corner door for the base cabinet.

We have the 38 x 38 x 30 Ikea Sektion base corner cabinet as shown here.

They call out a 13" x 30" door set. Typically i just subtract an 1/8" from each dimension and build the door. But i am confused because for the dimensions on this door per their website, typically the general dimension is the "system" dimension and then the standalone "width" and "height" dimensions are usually 1/8" less than the "system" dimensions. But in the case of the double door set it actually shows larger.

Width: 13 1/4 "

System, height: 30 "

System, width: 13 "

Height: 29 7/8 "

Thickness: 3/4 "

Could someone please confirm what size these 2 doors actually are?

Second question. Are the hinge cups on these 2 doors in the exact same position from the edges as a standard door?

Last question, are the hinges between the 2 doors the same as the other hinges or do i need to buy something different from Ikea?