Ok, it is a neat project and I think it is cool that you are trying something different.
that being said I think that honda tail is too big for the bike and looks ugly. It is way too long and wide. A longer swingarm might fix that and your shock problem (see below).
Also you need to rethink your shocks, you can't just lay them down like that and expect the suspension to act the same. You have now changed the leverage forces and those shocks are probably inadiquate for what you need. If you need shorter shocks there are 11" lowering shocks that cb750 guys use that could be adapted to your project.
as for the 180 degree head, JT Nesbit (of confederate fame) has a motoguzzi eldo that he did that to years ago. Basically he remachined a stock head to bolt on backwards. That bike was the coolest to look at and even cooler to ride, had a ram air effect when you got above highway speeds. With a honda head you will have to reverse the cams too - it is probably too much trouble for the sake of being cool but if you pull it off more power to ya.
edit: I was thinking about it and it might save you work if you reversed the barrels to. On a v-twin motoguzzi this is not that easy but on on a parallel twin honda it might just be a matter of switching the barrels right to left and remachining a cam but it is your bike - play with it.
Edited by - Geeto67 on Feb 27 2007 8:35:02 PM