Global Scale Modeller

My dear scale modellers,

A friend and I want to make a diorama about the Longues battery in France. But we havent found any blueprints of the bunker with the size . We've found this kit but it doesn't fit our budget and our goal of making it entirely ourselves. almost exactly like this kit, but then decked out like a real bunker. Does anyone have some blueprints with sizes or maybe some tips and tricks before we get started?

Love te hear from you guys,

Toon

After searching on the web and not finding anything, i thought to myself that i could maybe find something on sketchup, and i did! its up to size and anything. For people struggling with these sorts of bunkers, sketchup is full of it, and free! Tips are still welcome haha