You definitely can build one from scratch, but lumber is high and you can pick up a decent topper for many times under $100.
A decent topper would really have little wind resistance as they don’t really sit much higher then the cab. The insulating job in the videos looked pretty well done. I’ve had a few toppers in my life and they worked out very well. Yeah, not perfectly ideal, but a great way to get started. Best one I had you took the tailgate off and it had a short man door or I could open up the whole back. Building one you might end up with something a tad heavy. But the best part about all this is you can try this or that out and if you don’t like it you can change it up.
A decent topper would really have little wind resistance as they don’t really sit much higher then the cab. The insulating job in the videos looked pretty well done. I’ve had a few toppers in my life and they worked out very well. Yeah, not perfectly ideal, but a great way to get started. Best one I had you took the tailgate off and it had a short man door or I could open up the whole back. Building one you might end up with something a tad heavy. But the best part about all this is you can try this or that out and if you don’t like it you can change it up.