The build area for the 50 xy set up is 96 mm in the X direction and 54 mm in the Y direction.
The build area for the v1.1 and the version v1.2 are the same.
The build area for the Core 550 (50 xy setup) is still the same.
The only way to get the largest build area is to set up the B9 creator at 70 xy. The build area for the 70 xy setup is 104 mm x 75.6 mm.
Go to the Spec sheet for the v1.2 to see all three build areas for 30 xy, 50 xy, and 70 xy set up. http://www.b9c.com/media/files/Brochures/spec-sheet.pdf
As u lower the projector to increase the build area u decrease resolution and increase build times. You will still maintain the max build height with all three resolution settings when changing xy resolution setups.
Don't know what type of models u are printing but if u would share, myself or others might be able to help with layout and possible slicing of the model and printing in separate segments to assemble after printing or casting. Assuming u are printing very large models. If u want volume of models u will be better off with multiple print sessions than going to the much slower 70 xy setup.
The print sessions times are approx. 1/2 of the time on the v1.2 due to the HD projector output (lumens). Higher light energy and shorter exposure times. Print times on the Core 530 are approx. 1/3 of the print times of the v1.2. In other words what I use to print on the v1.1 at 6 hrs is approx. 45 to 60 minutes on the Core 530 (rings printed vertically). The Core 530 is set at 30xy and cannot be changed.
Hope this helps.