Until there is some air in the tubes there is no way to know how bad it is.
And actually, from the single image it doesn't look that bad with regard to the hard bits.
If it's cheap enough, just add a new set of tubes and build it how you want it rather than how the manufacturer thinks it should be or previous owner wanted it.
looks like a good fun couple of months work in the evenings/weekends to me.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club