I have had some time during waiting to PCB. So I have made some first lookup at the housing. 

I have to think about final position of missing components. There is a several option to place the pen socket, like on the front or back. Same problem with switch :). Position of PCB with enc, switches and display is I think the final one. Current dimension of case is 100x126x63mm. 

Of course this is still WIP, so final size could be changed.