I assume you were saying that we might be able to contact John Tennent at that forum? The thread itself only offers the same conversions, not the FS9 model.
I have a Jannik Dahl Porter that was never released, but as it's not publicly available nobody would paint it anyway. He also made a nice Avanti that also never surfaced. I wonder if John Tennent got the authorizations from Jannik to release the JKAI model, or that they collaborated on it.