How do you attach your buildings to an access hatch

I'd make a mechanical connect such as the bolt.

I have two hatches and in both, the buildings I place loose on them - and take them off when I want to open them, then reposition when closed again.

Thanks

I think a mechanical connecting will work the best also.  The hatch is too far away from reach to just remove the building when I lift the hatch.   

A bit old fashioned I used  screws. The machine shed was altered, adding a wood base for increased height. and small angle pieces were added to the plywood to keep it flat/level as it tended to curl.

We have several access hatches on your club layout , and we have glued the buildings, cars, people etc  directly to the hatch itself or the foam where applicable. These have been in place for many years and so far nothing has come loose or unglued thru many hatch removals.

Matt