Fitted the slugs into the jugs (pistons into the cylinders for those not down with the lingo), propped the whole lot above the conrods then slid the new gudgeon pins into place and fitted the circlips. Bolted the jugs down onto the cases
Also managed to get the gears installed after several attempts. No problem with the gears or shafts, just getting the indexing correct between the gearshifter and the shift camplate. Get this wrong (very easy to do!) and the transmission will shift past fourth (top) or first (bottom) and lock the gearbox. Still, it's done right now.