Just some lab notes during construction:

L/C meter measures

Binocular transformer: L1=1.578uH (2 T), L2=160.2uH (20-21 T)
Mystery toroid: 186.8uH (25T)
Mystery toroid: 0.315uH (1T through core)
T80-52D toroid: 16.67uH (14T)
2-30MHz toroid: 9.25uH (37T)
Shell tansformer: L1=2.456uH (?T), L2=0.244uH (1T)
Giant toroid: 56uH (19T)

VNA measures @ 1MHz

Binocular transformer: L1=1.55uH (2 T), L2=148-200uH (20-21 T) (hard to measure / poor contacts)
Mystery toroid: 200uH (25T)
Mystery toroid: 0.4uH (1T through core)
T80-52D toroid: 15.3uH (14T)
2-30MHz toroid: 9.27uH (37T)
Shell tansformer: L1=2.38uH (?T), L2=0.185uH (1T)
Giant toroid: 53uH (19T)

Primary Inductance

Good primary coupling when Zpri >= 4*Zsource.

Zsource=50 ohms, ∴ Zpri >= 200 ohms.
f(min) = 1MHz, ∴ Lpri(min) = 31.8uH

Not that good coupling is the goal here. In fact, it's the opposite.