no offense and not offended at all bro..
i fitted r33 dash on my a31 as well.. a lot of cutting here n there needed to be done especially near the firewall.. air-con? no problem at all.. everything fits perfectly..
the main reason i fit in the dash is the ease of wiring it.. all i have to is take out all of the old a31 wiring and fit in the new r33 wiring.. dash is working perfectly except for fuel gauge as it doesnt reads the real fuel capacity due to different shape of tanks between the 2 models..
but the gaps.. fuhhh.. a lot... especially on the side and nothing much can be done with it.. the dash also sits too low in a31 because the build of r33's firewall is a lot more higher than a31..