That's a good option. I did something similar with mine, just fashioned a trapeze tail piece rather than stop tail piece.
...Or you could use these, rather than the bushings that come with the 3 point bridge:
This might secure the kit's bridge better, but requires a smaller hole than the the ones that come pre-drilled.
I also think this could be done with the original hardware:
This last one would require new drilling rather than re-drilling, but the placement of the holes is sometimes out of alignment.
If the kit came without drilling you could choose whichever option, and it would also be less likely that you'd have an alignment issues.
Particularly if I could offer one more friendly suggestion... to increase the width of the center-block by about 1/2" on either side. I like Waz's suggestions, but the current center block is pretty narrow and won't accommodate some of the stop-tailpieces that are available for bass.