I do believe there is such a thing as a 59 degree W-9........the push rod clearance is machined in them and the outer bolt bosses are milled off.
They are somewhat limited as far as porting due to the material removed from the side of the intake ports for push rod clearance and I believe they were made with guides ( 3/8th valve ) installed.
The valley tray could be fabbed from sheet aluminum..........the rest is pretty accurate based on my experience.
I have a lot wrapped up in fittings and am still puzzling over a manifold and how to incorporate a thermostat.......or not to bother.
Intakes for the tall deck are very pricey and getting hard to find..........expect to drop around 450-500 bucks for a new one.
the rockers were under 1,200.00 from T&D......Bought through Competition Products.
Ryan hooked me up with lifters , but you may need something different for a 59 degree set up.
Ryan / Shady Dell has been a great resource for tips and " how to's " for me on my build.
The lifters for the 48 degree were 720.00ish as I recall.