That's a really great start Chris and keep up the build journal for everybody.
It will be good to catch up with you again at Stretton, consider yourself booked for some more drive time in my MG. (if you can stand the pain!).

The pictures seem fine to me.
And great car choice, always liked ERA's myself.
Cockpit size is a compromise but very important to get correct, the first time I tried
to build a CK, an ERA 'E' type, I could get in but not out...opps!

I don't think you need relieving cuts Chris.
Once you have decided on the curve, set up a few pieces of timber on a work table, bits of 3 x 2 at right angles to the side panels, lay your ply on top, then cover with towels (charity shop to save being castigated?) and wet them with hot water. Even better to use a fairly hot iron and get the ply soaked and you will be surprised how supple it becomes. Put some weights on the top and let it settle.  Once it's dry you will have your curved sides. The more effort you put to jigging it, the closer to your required shape. I suggest cutting the sides before curving. In reality the ERA has very little shape until you get to the back axle, which is where the tub on my ERA ended. There is a brief bit on mine, on www.gittrevillegp.com, then work through "The Cars", mine is in Cars B, but there is a mountain of info there so have a look at the lot. All those cars showing with differentials have removed them.
Don't forget to have a left and a right, guess how I know this!

Looks great Chris. Plenty of time to think little details while you are away

Keep up the detail of the build posts Chris, it's what this site needs to encourage others. Thanks also for making the trip to Coventry at the weekend it was good to catch up again.

Yes, there is no rotation so I could have bushed them but the bearings were available and cheap. I suppose there is a chance that they might start pitting after a while, we'll see.

I’ve never done anything like this Chris. How do you get it all balanced and running true?