My father and myself were actually considering doing this before I decided I'd rather buy a pre-made because it seemed like something we could do, you can try the website I linked or Google "Building your own acrylic aquarium" and you should be able to find tons of results.
what size you thinking and type in wall,corner,middle of the room, on stand,ground up 2,3,400 gl exc/and what kind of finish all glass exposed ,stone vinere exc some thing you can take if you move or permanant I could draw up a couple things if I know what you want
Even I checked out that site, I am exctied to what I could build. We had a 10 gallon saltwater, 2 days in I changed it over to a 23 g..... now we want bigger.... we thought maybe 55g, there's a awesome deal on one downtown... but maybe ill build my own and huge.. in the wall....sweet!!!!!