the ttrr challenge is very nice and important, you are right.
I've tried too to do it sometimes, but I have not much time as well and I don't like to not do it in the way I wanted... Maybe also Husk is right, just do it, the times you can and then post the result... Just take it easy...
I personally try to do it more frequently...
I don't think putting sub-categories would be a good idea, you spend a lot of time in doing the run, you deserve the top, the only top which exists.