2 way speaker build

I am in the process of designing a 2 way speaker using a couple of pairs of drivers I have , considering a transmission line format.

The speakers are two SEAS T25CF-001 and two old IMF mid /bass units which have a 7in cone inc rubber surround. The SES is 6 ohm and the IMF is 8 ohm looking at a crossover of 3000hz, 2nd order Linkwitz. Dont have any specs for the IMF

have attached a crossover diagram as a starting point.

would appreciate any feedback, t

Specifications
 

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