I think you can do it a few ways. Use a professional scanner, VID talks about this with scanning playfields. Places like office stores and such have large format scanners. Otherwise you can use a business/home scanner but you'll have to stitch the pictures together.

Then you could print to vinyl or translite material and just use plexi or glass and treat like a new style translite. I haven't done this yet, but if someone knows something better, they'll post up!

you also need a light mask

I have been trying to research the DIY back glass idea and come up with a lot of different answers thru a span of time. My main need is EM related and therefore things are a bit more simple than the current machines. I believe that most who are willing to go down this path, don't want to spend hundreds of dollars on a sheet of glass that will equal the value of the machine. Not looking for perfection, rather finish the imperfect game so it presents itself in a decent manner that can be enjoyed. It would be nice if someone could provide methods with current products available at most print shops with wide format printers. Maybe a new topic should be started for this?

Not sure. I have a HP picture scanner I use for playfield scans, or I use my big konica minolta at work for plastics etc. I've had to stitch long plastic scans together.

Some places might give you a hard time because of copyright issues.

Staples will not have a scanner large enough.

Instead of scanning, I used my Nikon 5300 DSLR 24MP camera @ highest native resolution on a tripod. Had very good results and no stitching required. Photoshop allows for lens correction, as the image curves at the edges. Images are then saved as TIFF files.

I've done translites from glass in the past, with shipping, trim pieces and a masking layer $147 USD.
The only thing the buyer has to get is a piece of glass or plexi for it.