Yeah, it was a sweet boat. I often wish I still had it. But I wanted a bigger boat, so I sold it.
The stick steer control (Ezy-Stik) is made by Ezy-Glide. https://www.ezyglide.com/ It's been several years since I built that boat and I don't remember which model I had, but the link above will give you the info you need. You order the control with the cable length that you need for your boat.
If you need a seat pedestal like the one shown in the photos, I bought it from A.K. McCallum. It came already painted an olive drab color that matched my boat, so I didn't have to bother with painting it.
https://www.akmccallum.com/store-seatacess.htm