Vince dont worry about asking the group to go easy, I dont think you will ever find a friendlier group than this.
Also welcome to W113 ownership you will have a fantastic time.
Like Ben I spend a lot of time in Spain, we have a house there but are currently living away due to work, but will return there in the not too distant future along with my car
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There are a couple of specialists in Spain, if you search the internet look for classic MB for sale, this should bring up the specialists, one in particular I saw does a lot of restoration work and sells parts. Also if you require parts, Jacksons of Poole have a great stock, ask for Mervyn he is a guru on classic MBs and SLS in Germany are very helpful and fast delivery to either England or Spain, both have good internet sites.
On the pessimistic side, you have chosen a very difficult route, taking the car directly into Spain from the USA. Everything I hear from people who have tried this warn against it and always recommend first registering in the UK to get it into the EU, in reality your 3 months maybe very optimistic, hope you have a good Gestoria!
You can always drive the car in Spain on UK plates, most major insurance companies have offices in Gibralter who specialise insuring UK registered cars in Spain and you can use the ITV instead of the MOT even with UK plates. I do understand the the UK is looking to go toward a 2 year MOT which also helps.
There are about 5 or 6 Pagodas in the Marbella area and a garage that seems to do all the mechanical servicing work for them, but not sure about Murcia.
Anyway good luck and keep the group advised of your progress on registration and refurbishment.
Rob Walker
1968 280SL papyrus white/green leather
Spain and Turkey