hal9000, I thought your first option, even before you suggested it, but my knowledge of SVG is null, and my building is quite complex. However your second suggestions works well. It is a bit of work, but it will do.
Well, you don't have to know about SVG, simply open the resulting file and edit it with some vector editing software.
Any way, if you want to try the second option, I'm thinking that probably there are more things to keep than to remove on your design, so a better approach than the one I suggested above, would be to make a copy of your design to another file (just in case) and then open the copy, select every undesired part and delete it, keeping the parts you want to print.
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