Boy, I'm not sure what you have going on there and I don't have any reference material. Doesn't seem right that R2 should be open to drain and the transmission still functon properly. Not sure about the tee either but may be normal.
The valve at the shift handle is very trouble free and as I recall it's housing is also marked like the selector valve. Also, at the bottom of the shift tower is a manifold (connection) for the hoses held together with two capscrews. I think it is also marked for hose location. If you separate the manifold watch for the o rings between the joint.
Hard to tell what someone else has done and why.
Does your donor tractor have the transmission and plumbing intact?
You may have to spring for a service manual if you don't have one. Sometimes on E Bay.
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