RF shieldcan design need help

Hi friends,
I want to design RF shieldcan.But i am newbie.It is for transciever and PA of mobile(in the same shieldcan),i do not know which material i can use.and i want to add some hole in the top cover,what principle i should obey?Anyone can introduce me some books or documents guide me?

You can use a metal sheet for the shield. The holes in the shield should be much smaller than the wavelength of the working frequency (<< 1/16λ)

I have designed one shieldcan(transceiver with PA) as attached photoes(with some questions),Can you guide me what's problem about it?
Thanks.

Everything looks fine for me.
The PA compartment seem to have enough space to get air flow for temperature dissipation.