Hi Kan,
My name is Francisco and I'm from Portugal.
I just moved from UK to Spain with my mini and I'm also going to race on the Mini-Empuries and Mini Barcelona.
I hired a company to transport my mini on the road, it is better to do it with a professional company because you need a permit to transport the mini in the Spanish roads, the permit is expensive and I think it least 3 years, so is better to find a company that already has that permit.
The marina prices will depend on how long you are planing to stay in Spain and most of them have a crane to put the boat in the water, them just speak with them to make a good price to keep the trailer in the marina.
I moved to Valencia, there are 3 or 4 minis here that will also race on the Mini-empuries, for sure I'm going to L'escala by sea and hopefully we can all go at the same time!
Hope this helps,
Kiko
Pogo2 - 549
quicova@gmail.com