Frame swaps are hard. Nothing fits like stock parts.
I'm in the process (after a very long break) of swaping my 46 onto a 1988 Ranger frame. The dimensions are closer than the S10, but there are still loads of differences.

I opted for the swap, because I'm cheap, and the Ranger was almost free. My truck is going to be a daily driver. The modern suspension is very important to me.

There is a lot of fabrication required, and even with my slightly better than average metal abilities It's still taking about twice as long as I thought it would.

It seems to me that when building these trucks you have to decied what you are going to have the most of, money or time. You can save money, but only at the expense of time.