I have a Janome 1600 and a metal frame that I put together at it's full 12' length several years ago; then I had to dismantle it when my son came back home to live and took over my 'frame space'. Construction and de-construction of the frame was do-able by myself; I can see very well up close and am quite limber, so getting down onto the floor and back up again (many times!) was not a problem. I have the manual downstairs, but have to go get ready to go with hubby to his doctor's appointment, so I will check back here this afternoon and can perhaps answer your question re: the legs.
My husband purchased a Lil Gracie for me a couple of years ago. We have moved it a couple of times to different area and always have taken the legs off. Mine it set to be able to go from crib to kings size. Unfortunately I have never used it. :( I have a standard machine and tried it once but not coordinated enough to get the movement down. Maybe if I purchased a regulator I would actually use it for more than a table to set my machine and cutting mat on. I truly would love to learn how to use it and quilt larger projects. Anyway back to your question. my husband says to definitely take off the legs. Hope this helps:)
I can't help either, but have the Gracie and the Juki that originally come with the frame. I bought it used and am still trying to figure everything out. Will watch this thread for help.
I have the gracie, no you do not take all the legs off, this is set up sort of in sections you can build the extra and add it to the middle(I think) I will ask my husband to be sure and let you know if different.this is good frame, you will enjoy it .