I've seen the same link you've posted, plus
Brierley mentions it in this year's edition of his guide. Planning to walk it in June. Albertinho and his wife will be there in a couple of weeks.
We do not go as far as O Porriño but have been there before.
Our itinerary is as follows as being a combination of 3 caminhos.
We start tuesday 28th of april next on the caminho Português central in Vairão close to the Porto airport and Vilarinho on the caminho (not the Matosinhos to Vila do Conde detour this time)
We walk as far as São Pedro de Rates or maybe Pedra Furada
From there to Barcelos where we stay 2 nights to have the opportunity to visit a friend in Braga.
Then we go on to
Casa da Fernanda where we will stay another two nights to meet you ..other pilgrims and have a nice time with Fernanda and Jacinto ,
From there we will take the train to Viana do Castelo on the caminho Portuges da Costa.
Next day we will walk to Vila Praia de Ãncora and the day after to Caminha or a Guarda
From there to Oia and next day to Mougas
Next stop is Baiona en from there to Nigrán
On May 10 th we will be in Vigo where we will stay two nights.
We'll continue to Redondela on the caminho central again
And next day to Pontevedra.
Here we sitch to the Variant Spiritual do caminho Português, the so called ruta de Salnés. First day to the albergue in Armenteira and the second day to Vlia Nova de Arousa.
There waits a boat who sails to Pontecessures on the caminho central close by Padrón.
Next stop will be Teo a Casalonga and the final day 18th of May we'll arrive in Santiago where we will stay two nights .
20 th we go back to Porto by bus and stay two nights there before we fly home on the 22nd.
We are looking forward to be on the caminho
We will leave home sunday next and stay overnight in a hotel close to the Eindhoven airport because monday 27th our Dutch King HM Willem Alexander celebrates his birthday which is a national holidayin the Netherlands and the city of Eindhoven attracts hundreds of thousands of people to celebrate this so the trains will be packed and our flight will be at midday so we do not risk getting into the full trains.