Hi there Kimmo,
My kit didn't have the glass/herex plate supplied with it.
I made a full-length 1.5 mm balsa/glass/epoxy separator plate, fixed to the fus.sides on 3mmsquare balsa side rails.
I incorporated two kevlar-hinged hatches, to give access to the radio,tank,and wing fixing.
I don't have the computer skills to post pictures on here, but Herr Lorenz (email [email protected]) should have the pictures I sent to him.
Hope this helps.