Dude... You mean you are missing the hard piping or just the hoses? If you're missing the hard piping, you can Frankenstein some stuff together I suppose...
At the very least maybe you can get lucky and source it out somewhere... You could try www.rhdjapan.com and send them an email telling them what you need.
I am missing the piping for the coolant under the intake do you know what they are called? I've heard you can bypass them but I want to be able to use heat at least. You seem like the person who knows the most in this page so I'm posting my question also but thought I'd see if you knew anything