"The biggest need they have is the basics of batting and they have had no real technical coaching in bowling. Video analysis here has been a winner for them because they are aware of improvements they can make.
"We set them a programme to achieve that and send them home twice the player.
"The clubs have been great too integrating them into the social side of things."
The group includes three members of the Scottish under-19 team and the sole female Cher van Slobbe has played for the full Netherlands side.
"I love the opportunity we get here to train every day to get better and that is what I want. It is a great experience," van Slobbe said.
Williams already has 16 international cricketers confirmed for next summer.
He says the Albion club is keen to host a team made up of overseas players which Williams will also play in with his brother Russell.
"I have spoken to all the club captains and Bay Cricket and everyone is keen on the idea simply for the fact there will be better quality cricket played," says Williams.
"We will not be taking opportunities away from anyone as we will be a whole new team."