clipping fish plate question

Hey all, I just cut, clipped and welded an s10 clip to my 50 shoebox frame. It went well and fits great. All four sides of the frame welded up nice. The s10 frame is wider on the inside so I left the excess on the inside and welded it up staggered for strength (instead of pie cutting the s10 to taper). I have fish plated the top and outside of the frame. This is my first clip and I am just wondering if I need to fish plate all four sides of the frame, or if two is sufficient? Four seems a little excessive, but I want it to be safe. Any input would be greatly appreciated. Thanks!

 

I just do the sides.

 

I tapered the s10 rails on mine, but fish plating the inside and outside should be plenty IMO.

 

Before plates:

 

i just do the sides

matt

 

I guess that answers that. Thanks guys. Hey, and ya'll do some awesome work, looks great!