I have worked it out now. I created a base, went to geoscape, then console, and tried devmap and map. for some reason, my installation of the current trunk version is defaulting to no soldiers hired. So i just had to hire and equip them. It seems that this "default to non-hired" thing is only affecting me, so its probably something i have done.
anyhow, now i have worked it out, so I am busy adding stairs, gravestones, pews, an altar and associated ecclesiastical bling.
the "bad s_blocklights size" thing: maybe different versions? i am using the current trunk revision. I would say "head", but that is open to innuendo...
It was 3 by 2 tiles (i am at work now, so cant check). mattn said make it bigger - so i have. i think it is 4 by 3 now. more room for graves! ooh, maybe a nice lych gate.
about the frozen tileset. it is all a bit industrial at the moment. my chapel might look a bit odd sandwiched by factories. perhaps is possible to set up an ump, with fewer factories. perhaps start a new village frozen tileset. i will look into it - assuming i can get this tile finished.
BTW (turning into an essay this). On IRC a few days back mattn and I where thinking it would be cool if the random assembly maps had spawn points for multiplayer. This is something else I plan to look at, but there seem to be plenty of other mappers - so have a look, if you are interested.