I did a king string quilt - maybe close to queen in width but was extra long per my mom's request (though I think it was a bit too long IMO) I swore never again. I used my walking foot and did semi- SID - I say semi because I didn't worry too much about it - then seems like I went diagonally but not 100% sure - think I did though because I did that on the one I did for myself a few years earlier. my sil has it now - thought it'd be good for them for camping because I used poly batting which is too hot for me and my mom wanted it lightweight because my dad would get cold but didnt like something heavy.
I'll do up to full size myself but if I want nice quilting or have a big quilt I pay my friend to longarm it