Here is a great collection of DIY equipment how to’s.
Lots of ideas for grip training, isometrics, martial arts equipment.
I especially the bodyweight section. It has TRX like suspension trainers, Jungle Gym like door frame pull up bars made of pipes, free standing chin up bars.
Hey – if you like Grunt's site, you might like to have a look over at homemadegymstuff.blogspot for more ideas!
Thanks for the suggestion.