Wow, those panels look wonderful! I'll get in touch with you later.
In case anyone needs the original Albs DK38-144 wheel I have 15 of them "in stock". I think they are just the right size for the unit. Take a look at http://www.midibox.org/dokuwiki/lib/exe/fetch.php?media=wilba_mb_seq:prototype_0.jpg
Link for the datasheet: http://www.albs.de/ecom/images/866003.pdf
EDIT: All the wheels are now gone, sorry.