Honda MT50/H100

[Fladdem]

Hello all, I'm currently ruining a Honda MT50, I have the engine, exhaust, carb, air filter but I still need the CDI for the H100 engine. I also have upgraded shocks on the back and a jack-up kit, I also have some MTX125 forks and drum braked wheel to go on the front. I'll be giving it a new paint job as well eventually. I would like to get a h100 wheel for the back too, as it is 18 inch rim compared to the 50's 16 inch, it will fit as the MB50 shares the same swinging arm which has an 18 inch rim. My question is just wondering what the H100 spindle diameter is? I was just wondering if the spindle will fit in the swinging arm without any hassle. Another problem is the MT5 expansion chamber is rusted to the engine and the exhaust studs are rusted up, its just a block of rust down there, I need to remove the exhaust before I can drop the engine out and I want to keep it undamaged as I want to keep all the original parts with the bike if I need to go back for some reason, How will I get the exhaust off? Another thing is; the back-end will be three inches taller than standard with the new wheel as well as the suspension but the forks are 6 inches longer so the front end will be 7 inches taller with the wheel as well, I am aware this will make turning awful, will dropping as much fork through the yokes as possible help to counter-act this a bit?
Any advice on any of these things will be much appreciated,
Adam
P.S. This has been planned for two years, I know it would have been easier and cheaper to have bought an MTX80, same size and the same power as mine will be when it’s done, but I want to do this, so please no “Buy another bike” like I always get when asking for help.
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Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.