Starlet Turbo huh? Quite a unique choice, not yer average Civic Type-R-wannabe nonsense... how old?
(i like running one in GT

quite a nice goer, and i suspect an awesome sleeperwagon if you've removed the telltales rather than charving it up)
answers to questions...
(yeah, this is bloody big, especially considering i dont have a G --- its accumulated knowledge from browsing over various threads containing the info)
1. heauge ... nowhere near as much as your average rice burner, but respectable and, more than anything else, cause great surprise. the current target to beat is 200hp out of the standard block (regular 1272 or bored 1341... stroked cc, who knows??)
2. probably quite a lot of them, someone else will have an example kill list im sure (though the thread might get locked / deleted for that kind of behaviour, as this isnt a barry site). the peak power isn't humongous, but like your toyota it's a pretty lightweight car even before any stripping and lightening, and it's got a good punch of torque behind it thanks to being supercharged not turboed, so the acceleration is akin to say a skyline (bloody heavy car!) with twice the BHP. It's the lotus theory... (even a stock elise with 110hp is stonking fast, as it's barely heavier than a superbike)
3. Standard specs, according to the manual:
83kW peak power at 6000rpm (limiter at 6600), 150Nm torque at 3400-4000rpm (??? this is from memory, hehe) and holds it well at both lower and higher rpms.
In imperial speak that's about 113BHP and 110lbft... not too shabby for a 1272cc engine!
Plus, all of the polo power units seem to be slightly under-sold in the VW literature, probably so some enthusiast doesnt take one fresh off the production line and complain that their 48hp 1-litre actually only has 46.9... this reportedly holds true for the G, too, with completely stock units being a bit variable and up to maybe 130bhp in some cases.
(for the GT - 55kW at 5900rpm, limiter 6800, and 100Nm at 3200-3400 or thereabouts. Translating into 75bhp and 72lbft... more horses but not much more torque than the CL... however the CL's torque drops off quite badly in the higher revs. Doesn't sound like much compared to a lot of new cars, e.g. the Pug 1007, but it's far lighter than them, and again undersold... even a badly kept 1991 GT will utterly destroy something modern being sold as having the same power output)
4. ehehehe....... money..... well a polo is a pretty solid, reliable car, but still not the cheapest to run. Mod parts other than the most standard things can be a bit hard and pricey to come by as companies focus more on puntos, novas/corsas, clios/saxos, fiestas/escorts/focuses, golfs etc, and the later polo models, because the mk3-and-earlier market is pretty small. Putting the effort in, you can make it look fantastic, but it wont be the local wideboy's usual trip down to halfords to pick up some £199 alloys, tinfoil spoiler, stick-on sideskirts and some w*nkerlights. Then again you might well be used to this.
Another thing you might be used to, is that a fair bit of the cash will go into pampering and preserving the charger. The G-lader (supercharger) comes under quite a lot of stress and arguably needs more careful and frequent attention than the engine proper does. It is "not unknown" for them to blow out, and with every one that does so, the total live-charger and potential spares pool takes a hit as they're no longer being made AFAIK. Cash poured into places like pitstop or jabba to look after them professionally is considered well spent. The G shouldn't really be considered a daily driver, for this alone, as it will be out of commission whilst the work is going on.