This is one of those things I wished I had taken more pictures when I built my stand. I used 4X4 posts on mine. It is way overbuilt but ROCK SOLID and as Sicklid mentioned HEAVY (concrete slab placement for me). Let me state I am not a carpenter just read a lot and realize that I could have done some things differently to better make my stand. Bear covering the trim work is really just a personal preference. I bought my tank on sale and had the horrible faux wood finish. They had black trim also but of course these tanks also had the lovely black silicone seams. So I painted my trim work with Krylon Fusion satin black paint. To me cherry and black really go well together.
I don't see any need for Gorrila Glue unless you plan on leaving your tank stand submerged in water. As far as bond strength, edge to edge most glues if used properly will result in a bond stronger than the wood itself. However edge grain to end grain joints(the butt joints used in vertical braces for example) Gorilla Glue is one of the worst. PVAs and water resistant PVAs far surpase Gorilla Glue some double the pressure required to break the joint. Another key is to dilute the glue with water and paint the end grain first let dry then glue as usual.
Add a couple dowels to the butt joint and you will increase the shear strength considerably. If you aren't comfortable with dowel reinforcement the following are weaker but acceptable choices from next to strongest to weakest, pocket screws followed by biscuits and then the unreinforded butt joint.
Clamps, levels, squares are a must! A glue bottle with a roller and a brush is also very beneficial. Make the stand level and square and you avoid so many potential problems. A close enough mentality should be avoided.
I glued and used screws for every joint. I used dowels in my vertical braces for added strength. I also wanted to make sure I had no flex in the stand. I used 3/4 inch ply top and bottom. This was skinned in birch veneer for looks. The sides of the stand used cherry venered ply. I made all the trim work and door frames from cherry. Canopy was similar method. Lights will be supported by inner bottom brace running on the inside.
Included a few images. First basically the guts. Can see the bracing and overall support used. Second picture after skinning the tank with the birch and cherry ply (router is a must) and also shows why cherry is such a great wood when compared to last aged picture. Image three and four are the canopy and how it is constructed. A lip is created by the ply and cheery trim work that sits down around the tank.