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Are there any instructions on the internet on how to build the halfwave coaxial baluns
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Plenty
https://www.google.com/?gws_rd=ssl#q...+coaxial+balun
https://www.google.com/search?q=half...0nCIQQ_AUIBygC
The coax balun would replace the balun that comes with the antenna. With two antennas they must be connected the same way to keep the signals in phase. It's a lot of trouble for a slight reduction in loss, and keeping the coax ends waterproof is a problem. If I made one I would use a metal plate with 3 chassis F connectors like at the bottom of the 7777 housing and the coax would dangle down from the bottom. As Calaveras says in his diagram, the combiner is merely the 3 pieces of coax soldered together. The 1/4 wave matching line is just a piece of 50 ohm coax 1/4 wave long taking the velocity factor into consideration as is done with the balun. I would look for an F connector T adapter to do it.
https://www.google.com/?gws_rd=ssl#q...ctor+T+adapter