The Squier Jaguar Bass SS is a wonderful instrument...
I played a show this year with the short scale Fender Squire Jaguar Bass and will continue to play it often. I really enjoy playing it. The stock instrument is lightweight and the sound is spectacular. Other than perhaps upgrading the pickups at some point, this instrument is perfect out of the box.
Do not DIY unless you are experienced
I give this instrument 5 stars, it's affordable, versatile, feels and plays great.
The manufacturer has removed the electronics schematics from their website, and this instrument has a proprietary 4 knob active control panel (the active knob controlling bass boost). I had to use a poor angle of a youtube video and a whole lot of good karma to solder the electronics back together after I put a different finish on the bass.