I personally used the travel lift at the Monastir marina twice with my Super Maramu and I have seen a 54 on the hard there - you just have to remove the back stays.
The yard is good - try to get a quote before hand - they will stick to the quote given (at least did in my case), however it is not easy to get a reply from them by mail and it might help if you know somebody there to get things rolling.
You have to check their works, but they know Amel very well indeed as a lot of French Amels go there. a
Personally I did not like the port de pêche as safety is an issue there in my opinion while Cap marina Monastery r is very safe!

fair winds
--
Robin Hutter
Carré d’As
Amel 54 #54
www.sailing4ever.com