I don't think the Laverda twin owes that much to the Honda design. Although outwardly (and internally) quite similar, they are very different beasts, with different engineering approaches in several areas and appealing to entirely different groups of riders. I reckon Massimo just recognised a solid basis when he saw one, it being so very different from the out-dated stuff the Brits were still churning out! One also has to keep in mind the situation of the italian market at the time. With horrendous tariffs on imports, the Honda "originals" will have been almost unknown in Italy at the time. Laverda was competing directly with Guzzi, Ducati and to a lesser degree Benelli, at the time the Jap offerings were slow to emerge. The world market was only slowly opening to the italian industry, hence the unveiling of the Lav twin at Earls Court instead of Milan. Of course the Honda 750/4 then made a huge impact, turning the entire industry on its head and having every manufacturer scrambling to produce something competitive. Reckon Laverda did rather well within the italian industry, being the only manufacturer to throw an entirely new design into the melee. Ducati simply pimped its existing bevel models even further, Guzzi introduced a new chassis for their irrigation pump engine. It took Allejandro de Tomaso to revamp the Guzzi and Benelli line-up and introduce the Sei and other smaller multis. But even these were never truely competitive due to high showroom prices compared to the japanese marques. It took Ducati quite some time to catch up, they were under recievership in the early 70's.
It says a lot that it is Laverda twin and triple models of the 70's-80's that are so often to be seen on the roads these days (in Europe at least) compared to the other italian marques of the time. I rarely ride out at the weekends without coming across another Laverda. The big exception of course is Moto Guzzi, they somehow managed to stay in the picture despite their (imo) rather mediocre products. But even the once-so-popular LeMans models are becoming pretty rare sights. When did you last see a bevel Ducati being ridden in anger? Or a Sei?
I have long considered triples to be the ideal compromise between a twin and a four, offering the grunt of a twin and the power and comfort of a multi. Apparently, many manufacturers have come to much the same conclusion, with modern triples offering what many, if not most, riders actually want. Even parallel twins are experiencing a renaissance, with liquid cooling, 270° phasing and balancing systems giving them a whole new lease of life. Maybe manufacturing costs play a (not inconsiderable) role as well... we might even live to witness the disappearance of fours.

It seems their remaining forte is the super-sports niche.
piet