It's going to be a rifle length barrel, and I would like to have a bipod, slanted forend grip, and still have plenty of space to add covers. Don't really like the look of rails, and I'd rather just go with a tubular forend, but then I lose all the accessory mounting options. I even saw one 8 rail forend for a rifle length, but that's just overboard. I'd never use all that rail. This will be my long shooter build. Heavy is okay.
As for going to the end of the barrel, I would think it would just be aesthetic. Not sure if there is even a forend that will cover 20'' of barrel, but maybe I can get close?