I've read differing stories about rota rims being brittle or being just as tough as Volk or BBS etc . As for who they supply to is enough to say they're alright.. Merc ,VW ,Audi ,Toyota all use rota from factory .
I'd be comparing prices of the same style rim from Aust and usa... Since usa buy them by the 1000s a day they will be cheaper than here . Saying that , a few yrs back i bought from USA a set of 17x7.5 5spoke rims for my mk1 focus. . The set cost $240(not rota) and shipping thru UPS was $200 (3 days) , the same here was $1050 .....
Just a heads up for ideas , tho I'd be worrying about the body more than rims at this point of the build !!
Keep up the good work and pics , cheers.