One other thing, you might want to either plumb your sump away from that wall or heavily insulate it. The low frequency sounds of pumps travel right through sheet rock. I found insulating the wall and adding a sheet of 3/4 ply (weight) helped quite a bit on my setup. Ideally some sort of mineral based sound abortion material would have worked better (something with mass). My computers are right in front of my tank so sound was pretty important to me. My tank is currently quieter than my PC running but is still too loud for my tastes.
Assuming you are doing a "picture frame" one thing I did for both of my builds (75 & 90) was to purchase white plastic "T" molding and cut one leg off of the T to make "L molding". I then glued this to my frame and used it as a "standoff" from the tank. If you don't do this the frame won't be able to sit flush (due to tank molding) and if you use wood to do this it will be at a minimum 1/4 inch think which takes away from your viewing area a tad. The white plastic can be painted with normal latex and blends right in with the wood frame.
On other thing about the picture frame. You *may* not want to make it feed outside of the silicon on the sides. It looks better if you have the frame just inside the silicon to hide it. My 75 was this way and looked better than my 90 upgrade.
As far as returns go you really aren't limited by the bulk heads for the return part. I opted (RR tank) to use both holes for return and plumbed the return pump itself (output) over the back of the tank behind the RR overflow. No reason why not since it isn't like anyone can see this.
It looks like you left yourself no front access (like my tank) while it looks tons better than having access panels tank maintenance is a real chore especially arranging anything in the tank. You will need someone to help with that and it is still frustrating. Simple things like arranging rocks takes *forever*.
Assuming you are doing a "picture frame" one thing I did for both of my builds (75 & 90) was to purchase white plastic "T" molding and cut one leg off of the T to make "L molding". I then glued this to my frame and used it as a "standoff" from the tank. If you don't do this the frame won't be able to sit flush (due to tank molding) and if you use wood to do this it will be at a minimum 1/4 inch think which takes away from your viewing area a tad. The white plastic can be painted with normal latex and blends right in with the wood frame.
On other thing about the picture frame. You *may* not want to make it feed outside of the silicon on the sides. It looks better if you have the frame just inside the silicon to hide it. My 75 was this way and looked better than my 90 upgrade.
As far as returns go you really aren't limited by the bulk heads for the return part. I opted (RR tank) to use both holes for return and plumbed the return pump itself (output) over the back of the tank behind the RR overflow. No reason why not since it isn't like anyone can see this.
It looks like you left yourself no front access (like my tank) while it looks tons better than having access panels tank maintenance is a real chore especially arranging anything in the tank. You will need someone to help with that and it is still frustrating. Simple things like arranging rocks takes *forever*.
its a good gig, but when the car breaks down it really sux, im on my 4th car this year for the job. lol, 
