Moving Nox to a bigger Viv - is it too big?

[RoflOnMyWaffle]

Hi guys, Nox is growing slowly but steadily She's reached about 60cm and 200g at around 6 months old. Not a giant, but she's healthy so that's all that matters to me.

In the next month or two I'm planning on getting either a beardy or a blue tongued skink. The problem is, they use bigger Vivs - been told by numerous people 4 foot by 2 foot by 2 foot is required, bigger being even better.

Now I only have a 5 foot wide space, and about 18 inches deep is preferred but can stretch to 2 foot at a push.

My question is, would a 70 cm BP ( hoping she grows before I get the tanks ) be stressed in a 5 x 2 x 2 viv ? Obviously I'd have to put in more hides, thinking one every other foot or so to keep it spaced nicely for heat too.
Would this be an issue? The other option is to block off a section to make the viv a size that I need it, then expand it as she grows - is that an okay thing to do?

The fact its now 2 foot high is a bit annoying, cause BPs wont use it all, so I might build like an L shaped "ramp" almost, so she can go up and the bottom becomes a hide too

The reason I'd get two of the same size is so that they stack securely, otherwise I'd get two different sized ones :S
What do you guys think? Am I counting my chickens before they can run? ( weird expression )