Here's a similar, commercially made version.
https://www.ebay.com/itm/Battle-Armor-Designs-Bed-Rack-For-16-19-Can-Am-Defender-500-800-1000/233159944490?hash=item36496a692a&enc=AQADAAAC8FjVrDbVsZ8oH%2F8PNHtt9VX4%2Fw7FZcmMuqsX8uaFEduVZnusitZpQCf0mQEziBxUzgTWKEQcOhMuBMIL6HETQmTq0Y7XBxfV3070ta8jTMjV6JsFjQ8Z8J5ewsrlOCawCtqSR9%2Bx%2B4l%2FMxZyW5y%2BSBjLpRkKy69JG8pucSm17Bc4qFkXGQyTCuzX5veb%2Bq0gAsQWIPyQ%2BYSjuO6wUE4%2BEE1i6e%2FtEhrfnwesBFLVnp455Jm%2FwnsBIxMv4rWa%2FP%2FOD970ptCqHj91If2Oqdf4PjHQZ2p7%2BLYsYZPRFzkYXjBffI5%2Fx92U1Yrmh9GaflPgnZuH3v2t7TuGtmbFgMl6klH7JXmElfYpXmPndWe2FyI0nDQP3HA0kBi%2FGHmpu%2BijhW7D9%2FVCkv24Y6ELU9KBRtbc2AyBslkdtT4NKnU4KUgWMpkeVMFnV2KbGIpZQYEL5fpyCE%2Bl5NtQeo8o6hp0lwpq%2BfK4DRA1zkt%2Ba1p438anZLrKZ8jI%2BAhubyhhbB%2B2yhfxAzOYNrOADuMzjmXk8kqegxlwxUtWaOIyVjRWjHVgsqRlra00eWt14UThEt84%2B%2Bakq9VHCYU5oWwdqyZLzViKrP7dTrbBliLHmxUjPQ1TvhTE78ukPctMXaQ0FY%2B%2BOaNm7d9fX52SxZcqEqODcY8cbbc6ZtAUvx%2F8MtwjXVF124jjQ0MyZfyRqRVLyXqiwNJ1ObVidyEq4hKAtGDsTaE2WWJBL9ymfUfV4hk9rAt%2FfvF%2BbGP%2BMa4rQAE%2BZYEBpz8iSJwUnbHtxzTJsThVyQKhvVHmRLeFdH2lpfdp6agBfRS%2FIT93K481gfibxKR9TmlxVT3hAgkb52TekJ2FUaOOBy27HkN%2FIudOrxQJJbOpnzRDmT%2FTLiMz7mil6OaCsiIyfO5SyhJvXpXuMkybLl9a845Ys6i9yKo2rUNwnHzpR404HKImjao051mFkYlrgNhjQuk1F4%2B9Zd23O4cdnkbVLa2ZBqJYfsBOW4OIgjiY&checksum=23315994449019a10a43e7c14d16bfaad654552a5320