These are my wheels: big fat pneumatic 330mm from Suprod. They do sit above the transom when underway, but you could of course remove entirely if you wanted to. I do like a bigger wheel, and I do like a pneumatic as well - I think they grip a little better, and a bit more forgiving. Size really helps with rougher terrain as well, like the steep wooden slatted slipway we often use.
Much as I like the Elling, there were a few things I think Honwave did better - the fuel tank reinforced floor area and strap on the Honwave is one example. Handles are another one - there simply aren't enough of them on the Elling for me, and I don't really like the seat-belt style grab rail along the side for holding on. I've added 2x big handles up front, which are good for two people pulling up the slip, and I'm thinking of adding a few more grab handles along the tube as well - although struggling to find soft PVC ones like the Honwave has (don't want more big solid handles).
You can see the handles I added in this pic:
