Flexi bit and V-band added. That's the "Phase Two" section 80% done; done enough for now.
And with a section of pipe, the exhaust is now piped back to about where the old silencer was, even using the previous exhaust mounting bracket. 
Quite happy with that.
In addition, I've also repaired the strap around the bottom of the
radiator, where it'd rusted through. Some black paint on that and
you'd never know!
Still haven't found the bolts and rubber bobbins for the radiator support yet, but something will turn up. I can fit them from the underside, so putting the rad in isn't preventing that from happening; which means longer run-time (and hopefully less of a shower of slightly-rusty water!)
So, bolts, coolant, more bodywork, etc.
Anyway. Here's what it looks like now; just know the repair got lashings of black paint before refitting.
Had to make a special emergency trip to get some additional
hose-clamps, but it's holding quite nicely. Need to get
some antifreeze, so I dumped the water back out of it again before I
left tonight; but now that the cooling system's together and I can run
the truck for longer, I should be able to start tidying up the
ignition tune a little.
Things of note from today's running session:
* Exhaust manifold gaskets needed! (Well, we knew that one anyway... )
* Starter absolutely needs as much heat-shielding as I can get it.
* The engine cover is going to need some pretty serious insulation. The back panel, where the lid hinges from (or, would hinge from, if it were fitted), was unpleasantly hot to the touch by about ten minutes in; I know that the exhaust leaks will be making that worse, but yow.
* Sounds real good!
* Tach doesn't work. Investigation required.
* Plenty of room for adjustments yet!
Furthermore, I've started running air-lines around the truck and whatnot. I have the wrong size olives in the fittings on the 4-way valve, but that's an easy enough fix and isn't a big hold-up for anything yet. Still need a good few fittings yet!
In total, I think I've run in about 10 meters of 12mm pipe, so far; which is probably most of the system... It's not a complex air-system, even with my typical overcomplication. (Truck brakes circuit; trailer brakes circuit; and an auxiliary circuit for air tools, tyre inflation, etc. There's a couple of other bits n bats that will want air, too; like the horn, and the air cylinder for the winch clutch)
At some point I've got to make the little pushrod that goes to the footbrake valve, too... it's all in the big list!