Washboard Modeling

create cube and set width=34.3, height=6 and depth=29.2

set subdivision width=17

select the top interior edges

bevel the top interior edges

select the top faces

extrude it and set local translate Z to 0.6

select the edges of the extruded facces

bevel the edges

create cub along the depth of glass and set width=1.9,heigh=5.1 and depth=33

create cube in between glass and top header and set width=11,height=0.6 and depth=29.2

use the align tool and align the top panel to the top header

create a cube and set width=1.9, height=3.8 and depth= 29.2

use the align tool to align everything together

duplicate the top stringer and move it to the other end of the glass

create cube and set width=59.1, height=3.8 and depth=1.9

use the align tool and align the left leg with the rest

duplicate the left and bring it to the right

select top header, both stringer and both leg

Bevel the selected 

Perspective view

front view

back view

left view

right view

bottom view

top view