Hey Craig
Nice to see an old waypointer back for a visit. ASAIK ET transmitter is transmitter_final. A year ago a novice waypointer was trying it out but AFAICT
he has been stuck in internet amber since last fall and hangs around like a wallflower

. Anyway the inactivity got the map posted to the
waypoint orphan list so you are welcome to go ahead.
Now to answer your question, I'll just switch hats to my Whitehall one

.
(1) post your WIP, Beta or release here on the waypoint sub-forum as an attachment (either rename your .pk3 to .zip or re-zip it). A revision readme is appreciated.
(2) Make/update an entry in the wiki
here and
here. (if you don't want to fill-in the wiki-work just say so and one of us can do it for you).
(3) If you think it is release quality (
checklist here and
readme template here or
here) them PM the bindlestiff so that he will know to include it in any new map-pack.
(4) When it is released in a map-pack it will be uploaded to the
file-base.
Then there are the papers to fill out for the EU....