Hacker help: Expedit doors/frames on a budget?

Photo: IKEA.com

Materials: Expedit 4×2, GLADSAX frames

Description: any ideas/suggestion?

Me + boyfriend decided to apply doors to our Expedit (being too messy at the moment).
I was thinking if anyone has used GLADSAX frames as doors and in case if he/she can help us with the hack.

GLADSAX sizes seem to fit quite well if applied to the EXPEDIT but I would love to be sure in order to avoid wasting money + a quite new bookcase…

Any suggestion/tip would be really appreciated…

~ chiara, Milan, Italy