I have the same tank/stand combo. It was my old system that was shut down when we upgraded this past summer. Still trying to decide if I will set it up again or sell it but anyway that is not the topic.
Good call on getting a custom sump built, the marineland sump normally supplied as a set is really a poor design.
As to the air hose on the top, discard the one that came with it and use a longer piece of air line. The short one will make all kinds of noise.
Looking forward to seeing it set up
![#mrgreen](images/smilies/icon_mrgreen.gif)
and if you need any info or run into any snags with it just let me know, will do whatever I can to assist.
Cathy