Well, plus points are it is a big bore, and has a gearbox.
Minus points are it isn't a long bed, and has had a LOT of work, and it doesn't look like it has been particularly sympathetically looked after.
Certain big bore parts and accessories are hard to come by/expensive. You still haven't said what accessories are with it, but I would want to see at very least the correct three/four jaw chucks with it, plus the drive and face plates.
Given that you have just bought it, I am not sure why you are asking for a value – surely you were happy to pay what you did for it, and that is what it is worth – to you?
Myford value is all about condition. I had an almost identical S7 Plus, except it was a long bed, and as new.
If yours went on eBay today, I would be surprised if it made, in that condition, more than £3,000.
That may not be what you wanted to hear, but you did ask………..