Bryan, I have looked at the wooden setups and there not for me, im useless with wood and dont want to use a liner, iv raked through shed loads of posts on this and pond forums without much luck.
Dee, the blocks would be stuck together with mortor if thats what u were meaning, i will try and get a picture of what im thinkin but its basically, solid concrete floor, build raised base with block, filled with hardcore(type 1) whacked solid, 4" concrete slab (single mess reinforcement), then block built upwards to 30-36" on this slab with the front being a glass panel. Im researching the glass thickness atm as i have 12mm already and as the tank wont be much taller than the original glass tank it was made from i dont see it being an issue.
if using rebar and hollow blocks then from the original floor, i would drill and fix rebar ever 6-12", slot the blocks over, acheive the same level using same method and fill blocks with concrete.