In the reconstruction - just a first glance impression - it would make more sense to swap the positions of the Black King and Queen!? In medieval chess, the 'Queens' stayed on the same coloured squares ( albeit probably white squares, but you know what I mean!!) and so if you transpose the two pieces the position is a nice mate with a Pawn.
Just my quick impression, albeit one that makes sense to me in my haste. Just trying to get my own article posted so not checked properly - humble apologies.
Thanks for this mate - it is always a good day when you post something, and the pictures have come out beautifully on my feeble computer, which is nice. Lovely.
Gathering material for my recent blog [The Queen's playing chess with the devil], I've found a latin manuscript [MS Reg. Lat. 430] of Jacobus Cessolis' "De moribus hominum et de officiis nobilium super ludo scaccorum". In f. 95r [https://digi.vatlib.it/view/MSS_Reg.lat.430/0193] is shown a position probably of medieval chess...
a reconstructive try by me...
_
and the illustrations of the pieces. Each illustration is followed by a figure of an actual chess piece that maybe helps the reconstruction...