Birdhouse from Hell...

I just can't win some days. This weekend I have spent an insane amount of time working on building my birdhouse. Designing this thing was clearly the easy part. Not matter what I did this weekend, nothing on this project has done right. My biggest challenge is that I have many angles and trying to get the corners to meet flush is virtually impossible. I have bigger than the Marianas Trench! Plus the material that I am using is frustrating. MDF (Medium Density Fiberboard) is easy to manipulate and forgiving but the complexity of my design is leaving me with pieces that just don't fit. I am really frustrated at this point. I sort of feel that the facutly know how to do what I am trying to do but won't tell me. I have ZERO building experience and once again I am faced with the reality that while my design is cool and possibly effective I don't have skills to see it through to the end. I am constantly changing things to meet my deadline and because I just have NO idea how to building what I drew. I am sure there is some equation out there that would help me but I have neither the time and that patience at this point to research. Why couldn't the shop monitors or my instructors just tell me how to do it? How does one calculate the angles so that the sides meet flush?
On top of all this I have caught a cold. Not sure how or where it came from (although I have my suspicions) but it is really annoying. The sore throat especially. The other morning I woke up and felt like I had sand in the back of my throat and no matter how much water I drank it would NOT go away. At this point I have a typography and my birdhouse project to get done and all I want is to get them done. I don't care how they look at this point...I am sick, tired and frustrated.
Ah well, this too shall pass...
M.