The mainnet proposal has launched, see: https://explorer75.org/namada/proposals/14 
Voting will begin at 23:18 UTC today (Apr 1) and last for 5 days.
Reminder 
validators will only be able to vote during the first 3.33 days (80 hours).
The testnet proposal was tested here: https://explorer75.org/namada-housefire/proposals/19
There was one error in the test: an incorrect tnam address, which was corrected. See: https://www.diffchecker.com/bdGp84Ru/