You can turn buggies into truggies & 6 months ago it was a good way to go, now with the LSP & X1CRT I'm not so sure.
The quickest way is to fit wheel adaptors like the Proline ones Part #6034-03:-
You will need their 23mm hex wheels to suit & tires.
The next problem is one of gear ratio's, see this thread:-
https://www.rcnitrotalk.com/forum/showthread.php?t=35321
Make sure you read through all of it carefully! Basically Hotbodies LSP crown & pinion gears will fit the Kyosho diffs to give you the right ratio's.
Then a body shell, depending on which you choose you may find you want to chop/modify the shock towers to get the body to sit low. You'll need a body post kit also.
By the time you have done all that you will have a truggy, that won't be as good as a LSP or X1CRT. These have longer arms & longer wheel base etc, so will always handle a bit better.
I modded my MP7.5 because I wanted a truggy, and my car was all blinged up & I knew I wouldn't get enough for it to want to sell it. Also I fancied a little project to work on. I also found a way to extend the wheel base by 1", but that is a bit tricky!
Hope this helps you to make the right decission.
Tim.