Here's a quick sketch of the idea. If you keep that swingarm, it will need help, (as will a lot of other areas if you go to 14 hp) so i hope you have access to a welder angle grinder etc....
The full shaded in lines are where i'd add tubing to beef things up--a rear view would show the added tubing continuing all the way around the perimeter of the swingarm. I went off memory and accidentally drew 3206 style hangars, so your front angle would be equal with the rear, not shallower as i've drawn it. If you look at the first page of "my yerf upgrade" thread, you'll see how i changed the swingarm pivots. that change moved the stresses to the frame and it ended up bending the main frame rear cross tube where it mounted. I'd beef that up as well. The first page also shows where these swingarms crack and bend at--with basically stock to 8-9 hp power levels.
As far as brakes go, you're best bet might be to add or have another keyway added to the axle and go with a keyed hub for the brake rotor.
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