Welcome aboard! Hope you will join our happy band in NASOC!
Looks like a lovely and largely unmolested project and wonderful to see it added to the growing list of Pre-War Singers surfacing recently in North America. There are a few within reasonable distance to you. I'm in Canada and I have a '28 Senior saloon, a '33 and a 34 Sports, a '36 Le Mans Special Speed Model and the remains of a Bantam tourer, which is sadly totally rusted out, frame included.
Looks like you need a front apron and the door handles are on backwards and the stone guards are missing from the rear wings, but this is all easy work. Would love to see more detail shots! Headlamp glasses can be a bit difficult to get if you want the true 8" flat 'full Diffusa' style, but if you don't mind a variation on the theme, some vintage car parts places in the UK have them on the shelf. If you need details shots of some of these items I can post them or send them to you.
The car number ( also the chassis number ) is stamped on one of the front spring hangers at the tip of the front dumb irons. It is the number that is also supposed to be stamped on the oval makers plate. These makers plates are available in the UK with proof of ownership. The chassis / car number should be within the range of the front and rear axle numbers, rather than the longer number you quote. I understand that some US states require a new number allocated by them to be stamped if there are issue with papers or ownership. I think Mike can speak to that as I recall he had that issue with one of his cars. Perhaps that happened to yours at some point. The body number is stamped on a plain style oval plate and this is usually also stamped on the bonnet spine fold, but unfortunately requires the bonnet sides to be separated from the center hinge.
Hope that helps! Do you have any photos of the other Singers your dad bought? As Official Pre-War Registrar for NASOC, it's my job to track such things so would welcome any info you have.
Best of luck with the restoration and look forward to hearing more. If you need anything, don't hesitate to ask!
Your Friendly Canadian Pre-War Singer Nine & Le Mans Specialist, Collector & Historian,
Editor & Pre-War Registrar & Canadian Contact -NASOC
Singer Enthusiast for 40 Years.
'28 Senior '33 & '34 Sports, '36 Le Mans & Bantam