I've got the complete set also, as well as what would now appear to be a half sheet (uncut) of these cards also, but I haven't seen this 'two up' sheet before...
Some of these uncut sheets materialised out of the Scanlen's factory when they closed down operations in N.S.W. and a few are known to have also been used as promotional pieces in Retail outlets that promoted them.
While it is probably rare, these cards are relatively common and I'm not sure the uncut Sheet is super valuable, but it is unusual and would be worth more than the equivalent set of the cards. I'd guess at $150 - $200 at the most.
Any post 1980's uncut sheet is probably from a source that saw huge numbers of them produced and not many of these cards hold high values (chase, signature and redemption cards excepted), however any pre 1980's uncut sheets, especially those produced before WW2 (or WW1 if you are lucky enough to have them) are exceedingly rare and valuable, albeit with the acknowledgment that because of their size they are difficult to store appropriately.