There are a number of BitX 20 kits available but you need to build them yourself. The BitX40 semi kit that is being sold by HFSIGS should be modifyable to 20 meters but I have not seen any details yet of the mods. Having a 12Mhz IF and working on 14Mhz may be problematic (I dont know but others may be able to advise you) You would have to reprogram the DDS for operation at 26 Mhz I suppose.
VE7BEE has modified a BitX40 to operate on 80 meters and I believe he is working on another and modding it for 160 meters. He is probably a good one to ask about 20 meter modding a BitX40.
Good luck
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Mike VK3XL
