While it is an interesting site (I've been messing about on it for half hour...), it does seem a bit pricey.
A 103cm wide x 50cm deep x 183cm high 5 shelf unit WITHOUT a solid back board and sides is £217, and that is before you source glass and fittings. It's cheaper to buy 4 LX36 Vivexotic vivs. To be honest, even using a deep bookcase from Ikea would be cheaper for creating a RUB rack.
that unit looks to be made of yellow pine- a softwood no-no... you would have to coat/treat it with something substantial to make it snakey-safe.... more time effort and cost
and you thought there was no such thing as a stupid question....
1.2.0 corns: captain haddock, sharon the tiddler and Darling Debbie. plus 0.2.0 cali kings: spot and Numpty... not forgetting the delightful Miss Lovely-Gonzalez-La-Poop apricot pueblan milk snake, and we all miss the Lodger who thought he was a cobra....