It's kinda difficult to offer too much advice at this stage and people's opinions on Viv / tank sizes differ so much .
I actually rather like bigger vivs as long as there are plenty of hiding places / quiet corners . That can be done easily with a two or more hides and loads of branches and pieces of dried bark . Sadly those two hides you've got there are far from ideal as they're both open- ended which offer very little security . I'd get two or three snake hides ( one opening) .
It's ideal time to make sure you get the basics bought though ... not sure what kind of heater you're going for but a thermostat is VITAL even though many shops will not mention them or say they're not required . They are .
Also get a couple of thermometers with wired probes and even a digital temp gun ( £10 off eBay) .
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