thanks all for the ideas. i think this sounds like what i had in mind. 
i'l have to go read up on trace(). this was a megapov feature that got 
put into 3.5, right?

btw, the warning was something like "Cannot use patch objects in 
intersection".

thanks,
ross.

>   Hmmm... seems I've a fixation with trace(), but I'm envisioning a nice
> use for it here. You can have some "reference" objects behind the "wall"
> plane, and then use a #while loop to place the bricks, tracing first a
> ray perpendicular to the wall plane, to see if it intersect with the
> "reference" objects. Then you end having a "individual-bricks"  wall,
> with holes "replicating" the reference objects behind. It would leave
> some work to do with the edges, but then you can place your
> windows/door/whatever into the holes, with enough "frame" width. Sounds
> reasonable... must try it later.
>

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