I received my first laser cut kit a few months back and went looking on the web for the best glue to use to assemble it. I found lots of suggestions all with drawbacks I could not live with or very expensive. I decided to strike out on my own and tried a product I was very familiar with for holding all kinds of odd stuff together. 

The product is Woodland Scenics Foam Tack Glue. I was able to use it on every part of the kit from the cardboard to the wood to the plastic, etc. It has a very high tack, no smell, it does not expand, you don't need much of it and it dries clear. I was able to clean up where I made mistakes, it dries quickly but not to quickly and I was able to complete the kit in two days. I think it turned out well, I hope this helps others.

This is my switch control house between the freight yard entrance / yard lead and the engine service facility in Waldbrunn, It is not located where it will end up, this is just for the picture. Freight yard tracks behind the fence.