I run an internal throttle. I rode an internal clutch once and I think it sucks, just not something I'd want, but to each his own. If you do get an internal throttle, DO NOT buy one from exile (buddy had one, they stick), Streamline designs or Vtwin (crud gets in them and they bind up) The latest one I have is from Moto-X and looks like a really nice piece, and it's sealed. I haven't installed it yet.
MotoXcycle-Unique Custom Motorcycles Chassis and Components . Make sure it has a return spring, and the bearings are all sealed so dirt can't get in it. Have a custom throttle cable made with a clutch type adjuster so you can take out throttle slack. It's a constant maintenance item, needs to be taken apart and serviced often. I love mine, and everyone said it wouldn't be practical for long trips but it's fine if you take care of it. Toss your right hand switches because there just ain't enough room in there for everything. The guy in the pic likely has dual master cylinders for the front and rear brakes and some sort of balancing valve so both brakes are operated from the forward control, but can't really tell from the pic. It looks like he has a brake line running down to the front wheel.
This is the old V-twin setup I had, but it fell apart on me twice.