http://i11.photobucket.com/albums/a186/Heroms/Blockland_00005-1.png
there should be a button that cuts any intersecting pieces and takes them away.
Where is the "detail" button? This happens any time I use the hollow command. The inside, of the hollowed object, is visible in Quark but once I export it to a dif and load it into Blockland, the inside is completely transparent but has collision still.