Hmm... It's not aerobatic but I don't know whether that makes a G-Meter more or less useful. A clock would make sense.
I like the comment on the blue-tack, but the previous owner (presumably) had blu-tacked a small pad there for writing en-route info down, I guess. I took it off to take a picture of the panel. I guess the blue-tack is because someone banned him from using a screwdriver.
The mag switch is from the Jos Pollak Corp. who I gather were from the US.
Presumably the tachometer is from a car, as is the engine. I agree it would be nicer to have one 'ranged' for an aircraft.
Step turn: your point about magnetism and the compass is well taken, but I think it's from an era before vfr panels were in any way standardised. If you want to see some even weirder ones try this page:
Fly Baby Instrument Panels
The few Turbulent cockpits I've seen on Google Images seem to have turn and bank indicators. Most of them seem to have venturi tubes so must have vacuum instruments of some sort or another. It's not an aircraft I would like to fly in IMC but I suppose it would give you a sporting chance of an encounter with a small cloud. I wonder whether it was a requirement of the time?
The rest of the aircraft was built by an expert, maintained by a numpty who did stuff like this:
It's currently a bit tatty, but it's had all the important bits fixed - much like every other aircraft I've flown. The big one is the paint which was applied to the previous scheme without preparation. It looks good, but is flaking off. For trim he'd used yellow electrician's tape which started flapping in the breeze. I've removed it: it pulls off the new paint as I do so.