Great job !!  Like the use of Stainless Steel Rule.   

Looking at body line this morning and pondering clamping brackets for the front springs

I am happily within proportion for width from the original BSA (42" and 47.5") at 900mm for the body and a small shade under 1000m for the track. It looks like the starter pull of the motor could stay inboard which was one of my concerns.

I will re-site the fuel tank on the other side to the engine to balance things out a bit.

I did not Rhys! Thanks for the tip, this engine is new territory for me :-)

@ Tinworm, I am a wood butcher by trade, built bars, guitars, bench work, furniture, site fixing and shopfitting  but have spannered things in the past. I built a Lomax 223 back in my late teens early 20's and it took me forever in a rented council garage with no electricity in the late Eighties.
I have probably got the cheapest tyres on Ebay on the front end, which I will regret I'm sure as although the wheel runs true the tyre does not when you spin it up. The rear is a bit better quality but still a no-name scooter 13" job.
The point of the tyres was just to get me started with sizes and stop me knocking hell out of the rims with all the dry fitting before paint.

Thanks all for the tips on turning the starter, it was a 2 minute job and seems well sited now.
Lots of little jobs this week,

Rotating the starter
Getting the rear wheel attachment milled, drilled and welded to its sub-frame, sorting out the chain tensioner / wheel aligning mounts.

Getting the brake retaining pin in the right spot and welded up

Making a set of spring clamps and adding a bit to the front end to make the springs sit parallel (more grinding and drilling still need fixing)

Taking a diversion when the guts of a door closer drew my eye towards it's rack and pinion, spring and potential Pitman arm.

Ordering the plywood (no bleeding birch ply to be had from any of my suppliers, had to go far eastern  )

doing some scaling for the body and being pleasantly surprised as to how well it scales, even with 27" seat back to scuttle top.

Grinding away a tiny bit of TAV for clearance around my chain tensioner roller (necessary on the slack side of the chain to avoid a clash with the TAV, looks like it will work)
 All in all not much visual progress but a fair few jobs done. Got to garden and relax today. :-)

Reading the USA forum, most people seem to agree 27 inch is about enough, I am fortunate in the original scales to about that at 0.75

Well the plywood came and it was the usual made in china stuff that makes me cry every time I saw through a void. A bit of careful cutting has just about got the stuff I need from the thicker board. The dash backer is yet to finally shape due to needing a physical reference to get a couple of measurements.  I just got 27" after the transition from 15 degrees negative at the seat back to 7.5 degrees negative at the dash.
Made the braces for under the floor, half lapped and glue blocked with P.U.
Made the framework for the cab side panels
Finished off the spring clamps.

Incongruous picture from the bottom of the garden as our local mountain was doing a good impression of Ayers rock this morning at sunrise.