Here is my new 75 stand that I built. It is made with 1x4 and 1x6 boards as opposed to 2x4's. I was somewhat nervous about doing this, but the stand is rock solid! Way better than the prebuilt stands i see at stores.
I doubled up the boards most of the way around. The boards are screwed together and I also used liquid nails for an extra tight bond. It has 3-5 coats of polyurethane on the outside and a coat or two on the inside parts to better endure the water.
The doors are not done yet...and I plan to build a canopy as well.
I would guess it cost about $100-150 so far for all the wood and various materials.