Wire frame

Hi guys I'm back, if you recall I was using SW for sheet metal design only in the flat and with help along the way from you I think I have figured it out.

My next journey is into the wire frame drawing portion and then that into a 2D drawing. For instance I have attached a frame which I want to simply use 2 X 4 X .125 rectangle tube (for some reason my drop down only show 2 X 4 X .250) I want end butt open at the end on the 37.5 and then cap. But as you see the one 37.5" tube doesnt go all the way to the end? What am I doing wrong? I cant find the cap end command either?TL%207732%20Structural.SLDPRT