Built in cupboard in alcove

[ChantelLouise]

Hi guys,

 

I want to build a cupboard in an alcove in my home - I have measured my alcove and it's 34 inches width, 14 inch depth and I want the cupboard to be 39 inches in height (including the plinth and the top).

 

I've never done this before and just wondered if anyone could help me with a plan such as measurements for the plinth for the cupboard to sit on and the sizes of mdf that I will need etc? Any help would be appreciated I'd like to have 2 doors on the front (no shelves inside).

 

Thanks