One one of the free shows last weekend, the quilter had used two dressers with drawers on either side and put a piece of plywood on top. You might be able to find something that would support the top and use as storage as well, or just add legs, sawhorses, even computer paper boxes on either side for support. Like the idea of putting part on desk and rest on backside that All Thumbs suggested. That would make it sturdier, less likely to separate.