Yes, currently have one, built that way by Randy Smyth. Make sure clew area will support all the force. The down side to no boom is that it is difficult to depower. Since mainsheet also acts as outhaul (no boom), travleing down will be more difficult. It tends to only goes down a short way on traveler without easing the main sheet. When you ease the mainsheet, you have now twisted the top, but powered up the middle at the same time. This means you have to let off even more main sail. If you are flying any extra sails from the top of the mast, spinnaker, screecher whatever, the mast is depending on mainsheet tension for support. If you are not planning on flying extra sails like that, then I would not worry about the negatives.
Good Luck