I did.
It was called "Closer Than Sisters, And Further Away". Basic outline: Q comes aboard to cause chaos and confusion, the crew mock him, and in a fit of pique, he hurls them into an alt.universe, where a more powerful Borg had captured the alt.Voyager and incorporated the ship into a cube, and converted Janeway into a Borg drone, along with the rest of the crew. Meanwhile a piece of the Borg ship, embedded in the hull after a battle, assimilates a crewman, and sends out a tentacle to snake into the ship and begin converting it.
The core of the episode was Seven and Janeway meeting their Borg selves (alt.7 was even more Borg) and getting them to fight against it. Also had a bit I liked writing that this advanced Borg knew how to capture Q lifeforms, so just when Q thought he could only be seen by Janeway, her counterpart grabbed him bu the throat and told him he would be assimilated.
Now I can take no credit for what was done later, but...
This was written just after the arrival of 7 of 9 was announced, or certainly early in that season. Long before a Borg Janeway was announced. Also, there was a scene in Enterprise where a mad tentacle tried to take over the ship, and I was all "Hey, that seems familiar!"
So, on the strength of that, my very first full-length script I ever wrote, I was invited to pitch ideas to them, and during the remaining seasons I would intermittently talk with staff writer Rafe Green about ideas. One notable one was the idea of an automated space station that could repair the ship for them. To be fair, if they recycled my idea, they took it in the opposite direction to what I had in mind (my station was benevolent, their malevolent).
There were some good ideas, I'm thinking of recycling them into other stories. Never quite got there of course - they said the stuff I had was either "not a direction they wanted to go" or "too close to something we're already doing" but were always positive and encouraging.
Oh, and I wanted to write a VOY movie. Adm. Janeway has to take the ol' ship out to rescue Bashir and Chakotay who are on an undercover mission beyond Federation borders, and recruits Kira Nerys as her First Officer. (Spoilers: Chuckles doesn't make it.)
I would love reading this script! :-D can we still read it and if yes, were? :-)