Custom assets and objects for map making?

[Neurological]

i was able to open a simple "map" on the model viewer and assign material to it but the model is gigantic, it is 3 meters high on my 3d app but on the model editor it seams to be 30meters or more.

I tried to edit the collada file by changing the meter value and no mater what i assigned the model is still very big.

Are you using 3dsmax? If yes I set up the home grid to:

Grid spacing: 8
Major Lines: 8
Perspective: 7

The rest all on default. A common wall is high 160 units.