"Boyer Fibrecraft Auscat" is discontinued in favour of the AHPC Flyer. I'm pretty certain about that.
I don't know anyone who still builds MIKAN A-cats today; I don't think you can order one anywhere, nor have I ever heard of homebuilding plans for these.
Is the waterrat still produced ? I would expect this boat to have been discontinued in favour of the A2.
That is what I can add
Wouter