Used NFEs seem to go for around $1100 for the frameset.
https://www.lfgss.com/conversations/243368/?offset=200
If this thing ever sells, I'm grabing it (UK build).
I noticed your height/inseam at 5'10"/33.5". This is quite a tall inseam for your height. Very similar to mine at 5'9.5"/34".
That NFE custom frame would fit us both very well.
#115 for the geo sheet.
#223 for a side-on pic.