It would cost a fortune for an all glass tank of this size. You would also need a crane to move it.
Cost so far. You be the judge.
Ply sheets @ $69 ea (Got these for a steal

) = $276
Screws were free

Builders bog = $39
30m x 1m of woven roving mat = $260
18L Boat Cote Epoxy = $340
Black epoxy pigment = $12.73
Epoxy solvent for clean up = $20
Silicone = $67
Polycarbonate lids = $60
Plumbing and lid hold down pipes = $90
36 x Besser blocks = $115
Total = $1279.73
19mm Glass = $1400 delivered(Supplied by Darren at AquariumsRus and I might add that he was a pleasure to deal with.

)
As you can see, I built the rest of the tank plus the extras for less then just the one glass panel. I had quotes ranging from $1400 - $2295 for the same piece of glass.