Hi Nigel. Magenta is no more than 200 km north-east of Genova.
It's on the Milano-Torino ancient roman way, 25 Km west of Milan.
If you're here for quiet a long time you CAN'T MISS the Museo Chiossone in Genova http://www.museochiossonegenova.it/.
It's quiet a while that I'm not there, but its great collection of Tsuba
is something that deserve a visit, not to talk about NihonTo, but I don't know if blades are still available to public.
Another good site to visit during your quiet long stay in Italy is Royal Armoury in Turin http://www.artito.arti.beniculturali.it/Armeria%20reale/DefaultArmeria.htm one of the biggest collections of weapons and armor in Europe, might be in the world.
If you are interested in others NihonTo collections in Italy (not so near to you..) please contact me. I'm sending my home telephone number
via PM.Sorry, no links in english. If you need help for booking I'll provide it.
Damn, somebody out there can spend 350.000 euros for an engine alone. Hope he loves NihonTo too. :D