Looking to convert my pick up and was seeing if anyone knew what engine fits in? Was thinking of putting a Fabia engine and box with struts, subframe and all the look 

If you are talking about the 1.4 8v Mpi then yes it would fit although i dont know immobilizer wise what it would take to get them adopted.
But you talking bout subframe and all that then I reckon its going to be hard.

@Jordan975

There are many topics about such project. Search both in this section and in section Classic SKODA Projects.