drawing greenhouse plans (greenhouse post #2)

i broke my brain from thinking too hard. this is what it looks like when i'm working on drawing up greenhouse plans. in my attempts to draw, i discovered too many unknown variables. how much will the glass overlap the 4x4 frame? how much will the roof overhang the wall? how wide do the sides of the greenhouse need to be? how tall is the back to make the door fit? how am i even doing the roof? 3 glass panes wide or only 2? it goes on and on and on. too many unknowns at this point to lock down an appropriate 'to scale' drawing. and quite a few math things i need time to figure out in regards to roof trusses and angles and lengths.