Rowan,
I thought of you while I was at Laguna Seca last weekend and tried to photograph the Ken Epsman DeKon Monza which I believe to be either number 1010 or 1011. Anyway it ran well and did not lose a left rear wheel at this corner as it had in 2014 !
Sorry the photos are a bit smudgy but I wanted to post them and hope they can be of some help to you.
Both Bruce Thompson and I were admiring the high quality of workmanship such as the louvers cut out in the rear widow.
Ken Epsman in the DeKon Monza # 20 ahead of the 1979 Greenwood Corvette # 88 driven by Jules Gounon.
Epsman DeKon Monza interior with Chris Cord's signature on the dash.
(Note the rear window louvers )
(Ken Hyndman photos )