At last! Someone is making these parts!
His name is Steve Nuttall. You can find him and pics of his products at Modelships.com. The barrels and scopes are comparative to Houshinya's. And the price too.
88mm-$5
20mm-$3.50
scopes-$16
prop shafts-$12
S/H is $10
He accepts paypal.
Here's the link: http://www.modelships.info/mwsphpBB2/viewtopic.php?t=2551
Jess