Hello, people! Just wanted to share with you my own experience. I have bought Celica in Germany about 2 weeks ago (congratulations to me) and have gone with it through all Germany, Poland, Lithuania and till Riga (All trip was 1889km long). The weather was awful (all time was snowing, but my car was on summer tyres), but still the trip was not so long and hard as some of you imagine. PECM is organized in summer, so if you will choose right directions (I mean autobahns), it is possible to get to Riga quite fast and the trip wouldn't be annoying.
We still hope to see representatives of Germany on the European-wide event! Real Celica enthusiasts can't miss it.