PCBs get more expensive with larger area, but it should probably be ok. I hunted down the Gerbers and uploaded to JLCPCB real quick, the cost for the bare PCB

PCBs get more expensive with larger area, but it should probably be ok. I hunted down the Gerbers and uploaded to JLCPCB real quick, the cost for the bare PCB at the current size (218x218 mm) is $22 for 5 pieces, excluding shipping. I thought it was interesting to have as a reference. Scaling up the PCB is not possible in their web UI since the Gerbers "lock in" the size, of course.