2x4 8ft
1 screen door hinge-spring loaded 5$ the kind you have to adjust
some thing like 2x1 or 2x3 1/4 ply wood about 3ft.
some small eye hooks 1/4 to 3/8th and some hooks to go with them ya know like a screen door use's

ok..so ya take the 2x4 and cut one elngth about 2-3 ft.... then two smaller ones. nail them together. i put the smaller ones under the long one.
so now you have this H shape deal.
ok.. one end ya get that spring hindge and screw it down at one end.
this is when you tak ethat 3inch by 3ft ply or what have you and attach it to the other end of the hindge.
now you tighten the hindge up alot.
now it should stay up. the 3 inch by 3ft deal is what you put your target on.
at the end of that 3ft peice put an eye ,screw it in. and put the hook on the frame.
i put the rest of teh eye hooks down its length.
you need some rope ,550, wire. when your ready to trip it via shooter(trip wire) or by RO.......pull rope spring up target./
typos rule

maybe ill do an MS paint later when im tanked!
oh from fixed pos. you could use a radio controled solinoid or such