Long bed to short bed conversion

[profe56]

Hi folks:
Next march My C10 69 longbed stepside and me we'll celebrate 9 years together. Since then I always have said that I would keep it the more original as possible. But I think I need to convert it to short bed, unless some of you said: don't do it!!!!!!!
I've heard that longbed are not apreciated as a short bed but I don't care.
if I convert it to short anyways won't be appreciated because will not be original.
the reason moves me to short it is because I don't have enough space at my garage as you can see at the piucture

I don't know how much space I'll have if is converted to short.
Now: I understand the bed will need to be cuted, but; question: instead of cut the stepsides and the side panels of the bed, and I think trailing arms are these parts availble?

Thank you