cool. Ill answer your questions first, hope it helps.
a. Nope, I use plastic all the time. So long as it's food grade, hdpe 5 (I think) it should be fine.
b. yes, 1.042 is probobly to style for an alt. see BJCP 2008 Style Guidelines - Category 07
d. overnight, yes, 3 hours, no. for 3 hours...