65 C10 bed and instrument questions

[nelson-ohio]

I have finally started to do some work on the 65 C10. From some previous posts, i believe mine is a C10 cab with a C20 frame.

I managed to get a front axel with disc break from a 85 C20, it's sitting under the frame now, need to drill the 2 holes and elongate 2 to make it fit.

Anyways, now I'm looking at the bed frame, not sure how the supports should go, wonder if anyone can give me a few pointers.

The questions I have are:
- I'm not sure how the middle support beam goes, I don't see any holes to mount the beam. See the picture showing the beam right above the wheel
- The space between the beams before and after this beam above the wheel seems large, it can't be right, can it? Anyone know what the spacing should be between these beams? Maybe I'm missing a beam? Should there be some holes on the frame to mount these beams?
- the level of the first beam, closest to the cab is about 1/8" lower, is this correct? Maybe it for the thickness of the front bed box?

Another thing:
I'm trying to remove the instrument cluster, I plan on putting a digital 1 in. However, I'm having difficulty removing the cluster, all the screws I can see are removed, but something on the bottom seems to be holding it in, I can not take it out. I'm guessing it's the key and knobs things, but not sure how to remove them without damages. Feels like there is something on the back side holding them in place, didn't want to force them. anyone can point me to any video links or posts?

Thanks.