This is what I used to build my top and I love it. I decided to go this path after one of the custom acrylic top makers screwed me over. This kit is made by innovative marine.
I don't know what your tank and overflow or lighting situation is, but on mine, I made 3 separate pieces so that the main front piece was easier to remove and I didn't have to design as many angles and turns. The other thing I added was a 3D printed feeder to cover the remaining area around my feeder. I have a 6 line so I didn't want to risk any jumping opportunities. The cons to this design is that it does block light in those areas. For a mixed reef for me, it was actually helpful because I was able to diversify where I could place corals ie. LPS higher up near SPS. Marine depot also used to just sell the corners and I bought 2 larger kits and cut to size myself. I just looked on BRS and I couldn't find it.