Hello!
A good set of plans might come in handy - there's one book that has just such plans in 1/48 - it's this one:
www.toratoratora.com.pl/pl,monografie-lotnicze-108-bell-uh-1-iroquis-huey-cz-1,3,188,0,0,29042.html
At about 10$ I think it's worth having, if you're building a Huey.
Also, be sure to cut out the "hell hole" - the openieng in the bottom of the hull, curiously this is almost molded closed, in all models! Through this hole you could look all the way up to the main gearbox, where the hook attachment is.
Good luck with your build and have a nice day
Paweł