Using 50 mm x 6mm flat bar this pic shows how you can make a twelve bar .As you can see in the picture you have to design your twelve bar to be strong enough to hold the bike upright as well as stopping the bike from flipping. The last thing you want is to wheelie back to the bar and finding it snapping off. The two rails of the sub frame should be connected together with your twelve bar for greater strength. When your happy with the way you have bolted and welded in supports it's time to get the right length on which will determine how far the bike is angled back. In this picture i have made it about one inch past where the taillight would be. Now here's the tricky bit you will have to park the bike upright on a flat surface, It is most important to have the skid plate welded on so that it scrapes with the rear edge of the blade, you don't want the leading edge shovelling in to road. To make this bar took me around two hours from start to finished. 

 CRASH CAGE 

Crash cages are used for protecting the engine cases of your bike without out this frame your risking potential fatal motor damage if the bike falls hard on its side from a crash. After designing the 12 bar I placed the bike up in that position and used some 15mm round bar and some pipe that would fit tightly over conventional frame sliders. welding onto that pipe some tube that would fit the 15mm round bar into. I then drilled holes and welded 12mm nuts to this pipe that I could tighten down onto the round bar. Then it was just a simple task of bending the round bar with help from a oxy set to heat the metal and shape it to fit nicely around the engine. once this is done the frame will need to be supported from moving back and forth a couple of pieces of 30mmx 5 mm fat bar bolted from a secure part of the bike forward to the round bar frame. I have had a few crashes so far and it has proven itself.

HANDBRAKE

Theses pictures show  Ducati clutch master cylinders used as a rear brake lever designed to save the bike from flipping if you wheelie to high where in some case you may not be able to get to the rear brake pedal, There are master cylinders available to operate both rear brake levers at the same time or you can use another brake calliper which will need to be aluminium welded to the existing calliper bracket.

Well you can see what happens if you are a fool...I was wasn't wearing a jacket and i was flipped over the handlebars after hitting the rear brake to hard while doing a vertical wheelie. Dam it now its infected because it was burnt on the front brake disc rotor now i have a meeting with a plastic surgeon for a graft. Its just not worth while risking your skin. 

I dont know if it's legal but hell it beats towing a trailer. 

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