Seeings how you so politely & exquisitely ask for info with such clarity, I don't mind the time it takes to answer your questions the best I can.
You pretty much said it all already: pump - filter - valve - cyls - that's it.
If you're basing your build off a Bruder 320, then the Leimbach hyd system should be adequate for your flow & power needs.
Shop here
http://www.ttm-shop.de they'll ship your goodies inside of a week if they're in stock (99% yes they are). This is another vendor for Leimbach product
http://www.der-getriebedoktor.de/sho...l.php?kid=3100 for great service & fast shipping. Tell them what you're doing, they'll hook you up with all the right parts (you can come here with your list quote & we'll look it over to see if anything is missing).
