It's a little hard to tell how big this guy will be, but one way to approach it is with a center zip (covered by a flap) so you can separate it and shade 1/2 at a time. I'd look at making my first one out of Weather-Max 'cause it's lighter than Sunbrella. It will give you at least 5 yrs.
Now, along the sides of the cabin top, install bolt rope
track, stopping about 1" from the fwd edge of the cabin top and the same aft. The forward inboard fabric
bit will have the boltrope sewn in it, so it will be well attached there. You'll have to decide the angle needed, but the forward edge will need a batten spreader sewn into it, and a bungee to a location forward of it on the lifeline. The side edge will want roll up clears zippable onto it than can also be zipped together. You will want to place ss grommetts for bungies along the side, to go to the lifelines
. Set up the aft edges similarly, with battten spreaders, and bungees to the back stay. If you work it right, you'll be able to fold and roll it back, and just have it rolled against its back spreaders, when you want uncovered, or split in half when that suits. This is a medium big project
, but definitely home do-able. Remember to first make a drawing (I make mine to scale on quadrille paper), then add enough for seam allowances that you will be able to manage, on the order of 1/2 inch, or 1.5 cm (not at all exact equivalents for each other, but easy to work with. Measure twice, always, at least, before cutting.
Battens are nice and flat, but dear. You can use heavy wall pvc tubing, too, with a few carved styrofoam circles pushed down it to stiffen it, and end caps glued on (so it floats if it gets away from you). And if you're going somewhere very hot, I'd consider white fabric
, even though it's a major pain in the neck for mildew and bird stain. If you do use white, use tailor chalk to mark what you need to mark, not indelible marker. Use a chalk-line to mark the longest pieces. Or, consult a proper dodger
or awning maker.
Free advice is worth what you paid for it. But as to can it be done, of course, and your own thinking about exactly where you need the protection is the most important part. A bunch of work with the measuring tape, and you can be in business. You can do this on a home sewing machine
, using the #18 needle and V-92 dacron thread. You should think of it as Mark I, because afterwards, you'll have ideas for improving it, trust me.