If you can measure the dimensions accurate, locate an experienced glass cutter, making aquariums any size you like for yourself is quite viable. Meddling with silicone glue for aquariums is not so tricky when you get the hang of keeping the work area and surfaces clean and cleaning up stray glue.
Setting the glass plates up to set accurate can be as simple as adjusting stacks of books to keep everything straight and steady while the glue sets.
I'd be very reluctant going straight in the deep end starting with a four foot deep job. Doing an intermediary 15" depth would be be a good start to build confidence, if ever a four foot deep aquarium split for unforseen reasons, the pressure and weight of that disintegrating mass would be a bit traumatic... and potentially that bit more dangerous
My first attempt at making aquariums were custom four foot long jobbies for some shelf positions, it all worked out right first time with no complications, though, filling them for the first time was a little tense, filling them in several steps to take the load step by step eased the tension up some
Regards, andy
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