......or, if you have a table saw available to you, you could get an adjustable dado blade. The router will work though. Using a router guide for your hand router will help.
garland

: Ok, I warned you I'd be posting a few dunce like questions.

: I've decided to go for the ply strongback (for the ES); 16 feet is a *long*
: bit of 4x2 especially if I expect it to remain straightish for 6 months in
: a garage of fluctuatinng humidity.

: 1. I buy a full sheet of half inch thick plywood (8 feet by 4 feet)
: 2. I cut it on a sawbench into strips 8 feet long and either 2 or 4 inches
: wide.
: 3. Here's the problem: I need to cut 'corner off' along the long side of some
: of the strips. The pic below attempts to illustrate: +++++++++++++++++
: +
: ++++ P L Y W O O D : 0.5"
: ###+
: ###+++++++++++++++

: The bits marked # have to be removed. How? Is that what a router is for? Is a
: hand router good enough? etc etc.

: 4. Then I go on to glue it together into a v. long box; a sort of coffin for
: a boa constrictor.

: Regards,

: Francis.