After some great advice on TMP and Pulp Alley forum about possible approaches to texturing the
surface of the Mayan-style temple, I have settled on building up a clockwork texture using thin card 'stone slabs' glued on and then covered with tissue paper brushed in diluted PVA glue.
I think some of my efforts to lay the tissue paper over the 'slabs' of cardboard are a little sub standard, but in general I'm liking the texture. Of course, the immediate benefits of this approach is that it is cheap and I can get moving on it strait away.
The question will be whether to undercoat and dry-brush, or to use some sort of texture over the tissue paper. The advantage of another layer is it will make the surface more durable, but I may end up losing some of the effect I've created.
Another pice of advice I received was to seal/reinforce the edges of the corrugated cardboard with thin strips of card glued on. It's a little too late for the edges of the bottom two levels, but I will try this on the steps and possibly the upper level.
Some other products mentioned by fellow wargamers that I will be looking at for future projects such as this will be: