I am curious if this EEC is a council where Governments send ministers or where the countries have representation? In other words are you building an upper house or a lower house model? In other words who picks these MEPs? From this it might work like the Bundesrat, a better path to evolving towards something the citizenry feel they can influence rather than an ultra-national bureaucracy? In my TL building I stretch this out of the German Customs Union and I kept its scope limited to let it stumble through to let integration be a happy by-product rather than the goal. And indeed, keep up the great scope of your vision!
The MEPs were elected by the members of the legislatures of each member country to serve for a term of four years which could be renewed. They had the right to resign from the European Parliament. There was the intention for MEPs to be directly elected sometime in the short to medium term.
There was a European Commission consisting of six commissioners who had the following portfolios:
Agriculture, Economy, Industry, Social Policy, Trade, Transport, and a chairman of the Commission. The commissioners and the chairman were elected by the European Parliament which can dismissed them. The first chairman was Paul-Henri Spaak [Belgium].
Thank you for your appreciation of this TL.