Thanks Peggy
Peggy: After a lot of analysis, we determined that the best solution is to rip out the old, illegal head, and cap the pipes. We went with a 5 gallon porto-potty and installed it to the same location as where the original head was. Think of it this way: The cost of coversion isn't worth the aggravation, between buying a new tank, buying fittings, and drilling holes in the old fiberglass, plus having a large bill just wasn't worth it -- and you don't get the smells. The bottom line is that we decided to keep it simple.