Hi
Welcome to the forum.
Don’t be worried about getting kicked out for going a non L series route, plenty of folk have done that before.
The mix of RB and tripples is a little different, but that is a good thing.
It is your car - build it your way.
In regard to looking for
“lots of ideas, advice, opinions and parts”
you should get all of the above, especially opinions
Cheers
PB