Not that many Havsfidra's around, what year is yours.
First photo was at dock, I raise the boom with the topping lift to make it easier to use the companionway, this photo is with the boom horizontal, with about 4" clearance to the bimini.
Used the hardware that came with the bimini, one mount secured near a stanchion both sides, and adjustable straps to pad-eyes secured to the coaming.
The bimini is 65" x 36" enough for shade, and enough space fore and aft to lean forward or back to see the mainsail.
I reduced the main leg by 6" for boom clearance.
I see you have a Nordica 20 on another thread, similar Baltic double ender fishing boat DNA to the Halman also from Canada, the Havsfidra from Sweden and Midget from Netherlands. The Nordica and Halman are lighter but can probably take some rough weather like their Swedish and Dutch cousins. If you have cash to burn check out the next generation new build Midget 26 and 31 http://www.dekloet.nl/english/home.html