The Cecilio type 4 looks like you could *probably* use some sort of a standard shoulder rest on it.  I'd suggest asking Pierre about that, as soon as he's back from his sailing trip.

There's a lot of options with electric.

If you have a Princeton and some FX to play with already, then you're in better shape than most beginners for electric violin.

As Uzi mentions, you can also get a USB audio interface to connect directly to the computer or use the soundcard line-in, if your system has one, and that can be easier sometimes for recording.  It all depends on what gear you have onhand and what sounds you want.

While the "solid body" electric violins of course aren't 100% "silent", they are still pretty darn quiet.  Definitely quiet enough to not bother anyone reasonable, if you play unplugged or with headphones.

Upgrades I found good to do early on for electric were strings, rosin, bow.  In about that order.  The strings they come with from the factory are usually pretty awful.  The rosin usually isn't very good either.  Those two items make a lot of difference in the sound, even unplugged.  The "free" bow they come with..Often a bit warped, usually rather heavy and "dead".  But I wouldn't upgrade that until you're ready to spend around 50$ or so for something like a CF bow.  

On strings, I'll talk a little and risk getting a few rotten tomatoes thrown.  What makes a great or good violin string for acoustic violins may or may not be good on electric as well.  Try to keep that in mind when you're deciding what kind of strings to try on your electric.

I've only been playing a couple years on violin, so I haven't tried a lot of strings personally.  But I have tried some.  I tried Helicores, which are a multicore steel string that some very good players (mostly of acoustic fiddle) swear by.  I could tell they were well-made.. But I didn't like the sound they gave on my electric.  To me and some others, it sounded more like a sax or horn than a violin.  Some people might love that, but I didn't. 

I tried Overture Ultras, which are a moderately priced synthetic core.  They sound pretty ok on acoustic violin.  Kind of a warm, complex sound, not real powerful, but tolerably nice.  On electric, they just didn't seem to have enough focus, and they also seemed to be lacking in response a lot more than they had on acoustic.

Ok, so what do I usually use?  Well, for at least most of the past year, electric guitar strings that have been cut down.  Ernie Ball regulars, to be specific.  Single electric guitar replacement strings are fairly cheap at most music shops.  The same gauges as steel violin strings will give approximately the same tension.  When I started doing that, I was warned by quite a few people that the roundwound guitar strings would result in breaking a lot of bow hairs.  Which yeah, I can see where that would make perfect sense.  Obvious logic.  Except they haven't.  LOL  They haven't been any harder on my bow hairs than regular violin strings (usually flatwound) were. 

So for cutting down electric guitar strings, I will rate it with a def thumbs-up for something to try on electric violin.  They're not expensive.  So far as I can tell, they haven't hurt anything.  And I've been playing the same set for about 10 months now and I'm just beginning to think they maybe are starting to need replaced.  At least the E string.  But it's "iffy", since they still respond well and they still have reasonable brightness and play harmonics ok.  I just think that maybe they aren't *quite* as good sounding as they were in the first months.  Not sure, though, it's a close thing.  But hey, considering the 4 strings totalled something like 3$ and change at my local music shop and I've gotten a good 10 months out of them with playing at least a couple hours a day.. No complaints.

But if you want something that actually comes in a package marked "violin strings", I can recommend another low cost item that I also feel worked well for me.  Rotosound violin strings.  Their "beginner" strings are silver plate/wrap, and they sounded decent (to my tastes anyway) and also held up well.  You can find those on amazon for under 10$.  They also make a chrome wrapped "pro" set, that I didn't like as well as the "beginners".  I thought the "pro" ones sounded too harsh.  But if you want to try those, they don't cost much more.