I don't have plans but they are pretty simple to build. I built 4 of them this year and I was very impressed. I think they could work on mainlines but they are only good for around 100 taps each. If you want to PM me your phone number I can text you pictures. I do have an excel sheet of what I bought and links to where I got them, but I think I'd probably need to update it as I have made some changes. A picture is worth a 1,000 words anyway.
What was really impressive to me was that I switched the "sap in" and "sap out" lines to pump my cleaning solution up through the lines. several of my lines are 1000' and have an 80' elevation change and the pump was able to pump solution to all of the top-most taps without an issue.
2016 - 2 x 4 Randy Worthen built arch and pans 11 taps; 2.625 gallons of syrup!
2017 - 29 taps; 11.625 gallons of syrup!
2018 - 30 taps; 98 pints bottled! New sugar house being built, new equipment coming!
2019 - 125 taps; 50 gallons made! New 2x6 Smoky Lake Corsair arch, drop flue pan, auto draw. Smoky Lake filter press and Steam Bottler
2020 - 173 taps; only 35 gallons made.
2021 - 242 taps; New record! 50.5 gallons made!
2022 - 321 taps; New record! 80 gallons made!