Loose hanging wiring, can't be a FAR/CS 23 certified aircraft.

Its design does predate FAR/CS 23... if that helps.

New -build WACO...?

Not a Waco, not built recently either.

Is this a parasol wing and not a biplane?
Davis D-1 could be a candidate?

It is a biplane.

A Great Lakes 2T-1A? I can’t match it exactly but the strut arrangement looks close.

There's a reason you can't match it Justin.... it's not a Great Lakes Trainer ;)

I get the feeling that a hint might be appreciated.... there is a link to a WWII bomber.

Depends if it`s one of `ours`...one of `theirs,over there`,one of the `others`,or the `other others way over there`,or even `down there`.....?

I somehow figured that, as the last guesses were all US types, most people would be looking in this direction anyway.

OK, so what do we know?

Biplane, probably US
Has link to a WW2 Bomber
It's aerobatic (g-meter)
Fixed pitch prop.
Supercharged if I am not mistaken (Gauge calibrated in Atm at 10 o'clock from the compass) showing ambient pressure and scaled poorly for a normally aspirated engine.
Two guages apparently both reading temp 'F' up to 200'. One is next to what I take to be the the oil press gauge (why the strange scale markings - 32 and 212?) so the other - presumably - what else but water temp - so it's possibly water cooled? Then why a CHT gauge too?
Is the front part of the screen glazed at all, or just has a high coaming?

As far as I know it's not a supercharged engine.

Consolidated /Fleet ?? ,later linked to Brewster...mainly radials,occasional Gipsy Majors...

As there is usually a Dutch link in Jelle’s challenges,
I will go for the
Curtiss / Travel Air 2000
aka Wichita Fokker

I'm sorry SLB, the Dutch link was somewhere else... I'm going to hand the reins to sycamore for concluding that it's a Fleet. Originally designed as the Consolidated 'Husky Jr.' in 1928, the model was later renamed in honour of Consolidated president Ruben Fleet (linked to Consolidated and their B-24, it was a tenuous one...). This particular example of a Fleet model 7 is based at Lelystad, one of only two in Europe, with the Early Birds foundation: Fleet 7 ? Order book ´Doen´

https://cimg6.ibsrv.net/gimg/pprune....27aa4f5998.jpg
Photo: Berend Jan Floor / AirOnline.nl, more about this aircraft (in Dutch) here: https://www.aironline.nl/weblog/2020...om-te-vliegen/

Thanks J,;afraid it`ll be OH..
Of note,maybe,is the front track-rod `loop` on the u/c...I don`t see any sort of oleo/bungee/damper arrangement,so it must be pretty rigid....unless anyone knows different....easy to groundloop...?

I don't know about the undercarriage, perhaps the loop indicates some sort of suspension internal to the fuselage that needs that much play around the other strut. When I dug the cockpit photo out of my files, I didn't realise that it had just emerged from an engine overhaul and general refurbishment just weeks ago.

https://cimg9.ibsrv.net/gimg/pprune....4a5fd00aa0.jpg
As it is OH, I hope you won't mind me posting one I don't know the answer to. It is a screenshot from an episode of QI and I am curious as to what it is from

From the pattern of the cockpit windows and 4 throttles, I'll say DC-6 or DC-7 ?