If you notice that the roof is made from a piece of polystyrene, well it should of been made from strips of timber.
Trying to clean up one side of a block of timber, so I could shove it thru a band saw and then into a thickness sander, to get the timber to size and a 'whoops' happened.
Anybody who says a simple snick from a scalpel blade/razor is painfull, well that aint half of it after a Buzz Planer finishes with a bit of flesh.
So gave up on the idea of a timber roof and settled on using something that is not as painfull or dangerous.
