I got 2 Sigma's that came off Noah's ark...( Had them well over 20 years)..
One will cut up to 333mm, one up to 600mm
Anything bigger.......I use a grinder or my Rubi nd200....
Can't see you setting that up on a customer's landing...!
I just use a vitrex pro cutter....
Plenty of dust sheets down, plonk it on the landing, and crack on ...