Sid I sent you a PM, But yes get all the pieces of the puzzle first then hold the box to the frame, You will see in relation to the steering arm where the box needs to be mounted. Also you said "no holes are predrilled" well get ready to start fabricating some brackets and other stuff.
Dbricco has a wonderful illustration of what he did to his and I followed his lead. I have pictures and such I think I posted on the board, may want to do a search or I can send them to your e-mail. In any case check out Darrens web page
www.jeepster.org read it and along with my pictures hopefully we can help guide you through it.
BTW thanks Darren mine worked out great.