My idea is simple, I will create several overlays that will fit the four sections of rooms of the board, plus replacing the center room as a market place. In addition, I'll make single overlay for only one room (alchemist shop, armory, tavern, temple, etc) I will also create a lot of single tokens to represent house furnitures, town folks, horses, market shops, well, sewer entrance, etc.
Here is a few quick shots :

This gives you the general idea!

Example of the alchemist shop!

A quick try on a market place, note the well, the sewer entrance, boxes, barrels, tree.

i think the tavern should have a big layout like this. You may notice the latrine on the right bottom corner
Finally, I think, we could create something like the rocks tiles to block the passages. I though about a shop in the market place, a city guard (maybe a Chaos warrior !), some crates or barrels... Let me know if you think of something else !
I think this will interest people who have created a set of house rules to improve Heroquest in something more advance as Dungeon and dragon, like me
I hope some of you are interested !



































