Nothing is impossible... some things are just more difficult & expensive!
The Pulsars don't even have subframes as such - monocoque construction with cross members. It would not need to look like a monster truck, or even need a full chassis like my Moke (unless it was for off road use as well).
IMHO keep the original track & fit monster flares (cheaper than custom driveshafts & will handle all that power better). Shorten the tailshaft to keep the mini wheelbase, or perhaps move the front wheels a little further forward so that the engine will clear the firewall. Would be easier to fit a custom extended f'glass front to suit once assembled.
You will need to sort out how you can mount the Pulsar struts, especially at the front without sticking out the bonnet. Speak to an engineer first - you will need a lot of custom bracing / mounts, and probably an integral roll cage to stiffen the shell.
But most importantly, DO IT
Mike