Actually, risky barrows is not really a part of the map, considering you can only go there by being teleported by the weird old man (if you could go there by walking from somewhere else, then yes, that may have been a bit of an issue). It's on a different height so that's not a problem.The builder wrote: I assume the difficulty comes from the fact that Barrows exists on the same map as the rest of the cities and such, like Lumbridge, and is not a separately populated space like the GWD. Since it exists on a separate map you can simply make a duplicate copy of that room, whereas you would need to copy the entirety of the world for Risky Barrows.
That may be wrong, but it's something to consider. Also the fact that risky barrows is a custom minigame, so he'd have to dig through the coding for it, and specify new spawns and everything for a new version of it located elsewhere. Not simply as easy.
I'm sure if Mike can do it, he will.
However, in about 20 minutes time, I've managed to add the instanced risky barrows for ironman mode players - to be released very soon. Enjoy. It ended up being way easier than I thought it would be.