Wow, great looking stand. When I saw the first post, I was thinking it was just another DIY build that would be exposed of covered with regular plywood. That looks great, it has style but the trim is not overly done so it's "ornate" while being staying pretty sleek and contemporary at the same time. Manzy looks great as well.
What are you doing for lighting? Hood, on tank or raised. I think it's one of the few stands of that style where hung light would really fit.
As far a lighting goes my plan is to run 2 ray2's, and a monster ray I will probably hang it from the ceiling or build a hanger out of conduit.
Fx5 may seem like a bit much for a 40g but I believe in lots of flow I will be running in an inline reactor and heater as well as hard plumbing everything into the stand with PVC. Between all the bends and the reactor a lot of flow will be lost.
On my 75 I ran this filter and was gettting 600gph, with no reactor and stock hoses. I'm hoping with all the bends and the reactor I will be at 400gph, witch should be perfect for this tank.