Custom Airport Shuttle Station

[delyrium 147]

Hi folks,
I'm currently working on an airport shuttle bus station and I would like to use a very old airport tram lot (8x6) which was part of a pack back in the days (SWAP) as the base lot. So it basically works like a functional airport.
However, I'm not able to do a "save as" in the LE to create a new lot (the button is greyed out) I can only press save and overwrite the lot.
So I made a backup of the original lot and saved the lot with my new custom building on it. For some reason the building is offsetted from lot so it is overhanging in game although I centered it correctly in the lot in LE.

I used the "Model Tweaker" to correct the offset which works but but for some reason the new lot does not feature all the other changes I made to the lot (eg. base textures, props etc.) it just takes the old base-/ overlay textures and props.

Can anyone help me? I read somewhere that it isn't trivial to make custom functional airport lots.

 

Best,

delyrium