You have said you would like a skinny tubed (steel) vintage bike to ride fixed.
I dont think a modern ally road frame with vertical dropouts and oversized tubes is the best place to start.
Just be a bit more patient and find the frame you are looking for.
You would be better off with any number of steel road or track frames with the correct dropouts, that you could renovate or respray and it could cost you less.
You have said you would like a skinny tubed (steel) vintage bike to ride fixed.
I dont think a modern ally road frame with vertical dropouts and oversized tubes is the best place to start.
Just be a bit more patient and find the frame you are looking for.
You would be better off with any number of steel road or track frames with the correct dropouts, that you could renovate or respray and it could cost you less.
Just my 2ps worth