Ofcourse the inner dimensions are: 426 x 290 x 159 mm And I managed to get 2x80HP out of it. As you can see I also used the sides another 5HP on the left and right and another 12 HP on the top. It needs some puzzeling with depth but hey it ad's another 22 hp! When it comes to glue I'm not an expert so I cant help you with that.