This question is kind of obvious.

When I build my Arrow coasters, I don't see any good supports for this coaster. Answer for how to make box supports like these anyone?

http://www.shyguysworld.com/index.php?topic=10884.0

another good set

http://www.shyguysworld.com/index.php?topic=10884.0

Yes, but how do I use those supports?

same as all the other supports