Dear all, A word of caution when using this great tool. I highly recommend trying to be as certain as possible about your building shapes, numbers of floors, etc., before creating Modelur blocks. Also, be 100% sure about the geometry (accurate planes, right angled corners, etc.). As noted in a post some time back, the push/pull tool can be used to edit the block, but the results can be disasterous, especially if your base goemetry is not 100%. Blocks can change and entire floors can simply vanish. My experience is to rather just explode the block and start again with fresh geometry; it's much quicker, and far less painful, than trying to fix the problem. Regards,Robert