OK... Going to the source of all knowledge...the longboard room

, but yes my request is serious
I am about to shell out for son's first board.
Has been riding 6'6" and 7,0 soft tops in surf school and my 7,0 "big guys shortboard". Doing really well.
He is 12 weight 45kg and stands 5'4" and growing fast (he is a tall 12yr old).
Not wanting to make it difficult transition, not going to to go to a full grom board as he is not ready.
Thought has been on a
Simply thruster set up 6,4 x 19 x 2.1/2 or around these dims
As many here would have kids move into surfing, hoping the wisdom can be imparted,
thanks all and may Santa deliver your very wish
cheers
Gmac