I have no personal experience from the Viper1260 but as it's an overclocked 060 (and the chance is there are some with XC's CPU) I'd say put some cooling on the chip asap. As far as I know and can see it should fitt nicely inside the desctop even with the trapdoor closed though due to heat I sugest either to modify the trapdoor for better airflow or compleatly remove it (or as I did with my B1260... make your own custom one). Save the extra € the simm cost and trow on a much cheaper 32Mb simm from the nearest discarded PC. 206€ for a 060 card for the A1200 is pricey but you're not likely to find one much cheaper even used so go for it if you got the cash.
