Anotherl problem with any kind of offset gun configuration would be focus. You couldn't get focus at the top of scan and focus at the bottom of scan, at the same time.
You could correct for keystoning pretty easily.
Retroplayer, let me know if you need any more scans.
There are some Escort 4's on Ebay, various prices:
https://www.ebay.com/sch/i.html?_fro..._odkw=escort+4