I have a really nice LeClerc rigid heddle loom. I like its portability, the steel ratchet brakes, the way I can put a nice, long warp on it. I would, however, like the option of adding a second heddle on occasion. I am not a woodworker, but I think I can get someone nearby to make a second castle for me pretty easily, and I assume I can bolt it to the horizontal frame, behind the existing castle and horizontal stretcher, without weakening that frame.
But I don't know if the overall depth of the loom (17" from outside of breast beam to outside of back beam) will make this actually unworkable. Will I be able to get clean sheds? Will I realistically be able to thread the two heddles? Are there other things I should take into account before modifying this loom? What are your thoughts and your experiences?