Nice job Paul. I have sooooo been where you are as have others. The work you are tackling is hard stuff mate and will take loads of your patience and determination. People here will gee you up and keep you afloat when you feel your worst
. You're making good progress and seem to be a realist as oposed to a dreamer. Do yourself a favour though and invest in something a bit more 'up to the job' than just your bare hands in terms of your metal bends etc for your sills and outrigger's etc. You made a better job of yours than i made of my first attempt but it's a slow process trying to get neat folds etc. I bit the bullet and invested in one of these http://www.machinemart.co.uk/shop/product/details/cmf24-sheet-metal-folder and it saved me a fortune in time and swear words
once you have your measurements sussed out you whack it in the folder and bish bash bosh....Nice and neat folds in the metal. It's by no means on the scale of an experienced metal worker but for the inexperienced fool such as i it was/is, just the job.