Hi Henk,
How long is a ball of string?
The answer to your question really depends on the depth and duration of the maintenance planned for each check and the amount of aircraft in the line operation your going to supply.
For Base: What is your delivery time? Are you going to work shifts on it? Two or three shifts? What facilities do you have? Who will work the engines / gearboxes / components?
For Line: How many aircraft are supporting what type of operation? What Shifts will you want? What is the expected utilisation and reliability of the aircraft?
Manpower also depends on the accepted maintenance set-up of the organisation and what they decree is a maximum amount of personnel for certifying support staff to cover.
Good luck with your project!