good on ya for doing the work yourself! i've had a bit of fun with my huskies over the last 3 years, and at the moment am laid up with a bust ankle after the best one tossed me on a street race a week ago
my 510 dropped a valve and did basically the same as what your did - rod through barrel. so that got upgraded to 530 on the rebuild
my 450 ran the main bearing and scuffed everything when it ground to a halt. rebore and replate and i cleverly sourced all the parts from ebay/halls/somewhere else rather than the local stealership and halved the rebuild cost. it lasted 9 hours before the pin pulled out of the piston and again rod through barrel and mashed valves. it's still in bits but slowly being put back together so i can sell it for about the cost of its 2 rebuilds. my advice - no fast by ferracci/wiseco piston!
my 450rr handles like a dog. an angry one. and it bites. oh and during the first race i did it split the radiators, overheated and scuffed the barrel when the piston cracked.
don't worry though ... by the time my ankle is out of plaster they'll all be going and hopefully i'll be fit to race in mid april!
they're a bit of work, but i reckon in spite of all the failings they're almost worth it! i'd prefer not to have a broken ankle of course....
good luck with the build - hope you're out there enjoying it before i am!
2005 Husky SMR510 with go faster bits - it's a 530 now
2006 Husky SMR450 resurrected with some smrr bits ... oh no wait it's blown up again
2008 husky SMRR450 mostly stock. if only it would stop trying to kill me!