This may help someone
I was fortunate to acquire last year 3 assorted kitset buildings made by a small USA company called "one thirty second", original website was scalebuildings.com (it's defunct), through a dealer in europe. Cost a fortune with postage, but they looked pretty neat.
When I got them, I saw how they were designed with little lugs and slots, as per first picture below, and were approximately 3mm thick (1/18th)
I figured I could replicate them in 3mm MDF.
Very easy, cut with a jig saw, leaving some "meat" around the lugs which I sanded back to square against pencil guidelines I had drawn, drilled opposing panels for the little holes for them to go into, checking that the panels lined up, and used same small file to enlarge the drill hole till the lugs fitted in.
Made a replica - took almost exactly one hour excluding stair case which I didn't copy.
Here they are alongside each other.
But I realised the 2 storey building obscured the back inside straight at 2 driver stations, so I used the same technique to create a single level 4 bay pits from scratch.
Part finished, ready to wire for lights. I used the Carrera papaer building pictures, and just stretched the picture in a paint programe for printing so that the garage doors fitted the size of the pit bay doors and length of pit bay. I just glued on with PVA.
In place, getting close. The pits have 12V LEDs with integral resistor glued into the ceiling, the wires pass down the inside of the front well behind the overlap beside the doors. I just held them all in place with hot glue. Crude, effective, will never be seen.
In place
By night
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