Thank you for the response. That was very helpful!
Based on the input in this thread I believe to conclude the wood kit from Classic Wood Products will my best bet. In addition, searching for pictures of 1927-1928 Chevrolet Touring reveals the vast majority of the pictures are of identical models to what I have. Much of the chassis will in addition anyhow have to be reconstructed from sheet metal anyway.
There's a bit more information in this old VCCA forum thread:
1928 convertibleIn short, the car was purchased by my great grandfather in 1932 (hence 4 years old / used). It's been passed from father to son since and I'm the 4th generation to own the car.
My grandfather was a mechanic and he performed all of the modifications. E.g., the engine is a 1934 DC Standard 181 CUI. I've been told the engine was from a Chevy truck. The engine was gifted to my grandfather as the head suffered frost damage and was cracked several places. A colleague of my grandfather welded the head multiple places and managed to fix it. My grandfather installed the engine around 1950-1951.
In addition, he installed two circuit hydraulic brakes with adjustable front/rear bias. Quite an intricate system utilizing a window wiper motor to adjust the brake bias via two hidden buttons under the dash.
The re-routed exhaust is due to a storage bin installed under the rear seat.
Electrical wiring due to the above brake system, one extra remote light, two different horns, light below the dash (map light), high-low beam as levers on steering column, light in dash etc.
The car is therefore not original but I find it true to it's story when knowing when it was modified (and by whom). Hence, if I'm possible I will strive to restore it to the same condition as my grandfather modified it to.