I knew it couldn't wait till after the wedding lol just hope you got the ok from the future Mrs.
are you going to use a 20 long for the sump that would fit perfect under the 40,
if your going to have 3ft or more upward travel to pump water back to tank you may want to look into a 950gph or 1250gph , I have a 700 gph
now and I barely get any water movement out of the return, I've been looking at a 1250 for my set up ,
I've been using the sea clone in mine it seems to work better as a internal skimmer , don't seem to have the problems I had when it was a hob
, once I lost that long tub it's like a totally different beast because now it works only thing I did change was the pump went from a 100gph pump to a 200gph pump