Thank you for all the feed back. I think I will do at least a 4' sump with 24" width. Height will be probably around 17" for a capacity of 85 gallons less the needed volume for shut down.
I am planning an external skimmer and return pump so hopefully that should allow me enough space. I have not yet decided on a refugium area. I run a small one in my current sump on my 130 gal.
Any opinions on the refugium, skimmer(I could go longer than 4' and do an internal skimmer), return pump and sump flow will be greatly appreciated. I will try to post some pictures soon (just need to figure out how).