Kent,
Jim Webb's, book on triggers, has drawings of triggers used by the Honaker family. They use a front mounted main spring. With this style you would not have the main spring in the way of a pistols grip bend. They do not look that hard to make but Jim says that they were hard to set due to the way they are made. He has another drawing on how to improve them so that they will be less difficult to sett. Next time you are over I will show them to you and if that looks like what you need I will see if I can scan the drawings.
Dennis