hello everyone, im haveing trouble decideing how to install the bridge abutments and bridge in the pictures below. i have never done anything like this before, so im a bit confused. the benchwork is open grid style with 1/2" plywood sub road bed. the frame is 1" x 4"'s spaced every 12". the picture shows the location i would like to install the bridge at. the straight black lines are showing where the frame supports are located. as you can tell, i chose a place in between the supports. any information is really appreciated, i would really like to be able to use this bridge since i spent a month building it....lol! thanks everyone!