said and done!
I bought the paper houses that Grot 6 linked to... 20$ for about 40 buildings in two pdf:s (and the possibility to print how many I want...

) I went to a professional printing service that printed the pdf files on heavy cardstock (cost about 40$)
I have started to assemble them, which is pretty easy whit the use of a glue that bonds fast.
Some pictures:
this is how they look when printed and unassembled
some small houses
a church (I'm not sure I really like the church... but my snipers must have a church-tower to live in...)
some ruins...
an other ruin...
I'm going to go over the white edges whit a black or grey pen to cover the cut-sections...