Here is a brochure from Electro-Voice regarding their Building Block system. They give information on recommended box sizes and vents. These, it says, were based on T-S criteria though no information on T-S parameters or alignments is given.
You'll note that EV is putting the mid and hf horns in a vertical orientation.
The T-35A is power rated at 5 watts continuous.
I'll add other EV info here as time allows.
How_to_Build_an_EV_Component_Speaker_System.pdf