Ideas for a explorative hog

I very sadly lost my sweetheart hog Trio today after battling illness. To take my mind off it I am planning the renovation of his top half of the viv into one super massive viv for Lulu.

This is the viv:



Lulu currently lives on the lower half. It is 5' long, 4' tall, 1.5' ish deep and she will have the lot, all 4 levels. I am wondering what to put in for her to make it a fun space. She is not even remotely interested in toys and instead goes miles on her wheel every night. She currently has a tube, a flying saucer, a separate litter tray, a sand bath, a nest house (which she doesnt bother with), plush kitten bed with blankets. This takes up her two levels but she will have double that space.

I am thinking about a foraging box, giving her Trio's wheel so she has two to choose from, another tube, a cardboard box to wander through... none of it sounds very exciting to me though. Would be great to find something to really capture her interest. Lulu absolutely LOVES climbing, digging and exploring.

My partner is wondering if anyone has any ideas about a suitable material to make a sculpture out of - kind of like a papier mache / plaster / resin sculpture to put on one level simulating gently rocky ground that she can climb in and on with largish holes to go in and out of - like tunnels? I think Lulu would adore it but dont know what would be a safe material to use?

I am sorry to hear of your loss.

Have you looked on RFUK? I know some people on there have made their own background displays and I am sure I have seen some tutorials on how they have made them.