Thanks a lot guys!
And I forgot to say thanks to Bigwam/Thomas, he provided me with some excellent bits of tupperware and other parts for my pack!
As far as the screws that hold the trays together are concerned, I will keep them as it´s an easy way of taking things apart again, as I´m planning to upgrade a few parts on the pack, e.g. the toolbox with a more accurate brexton box, and if I can get a hold of it somewhere, I might try a cast of an original cistern. Moving the black/upper trays down a little will definitely happen as soon as I have those parts to upgrade.