Thx for the mention. I don't supply a kit as the unit I make is stub tune calibrated to compensate for the PCB and the connector UHF tolerances and comes completely housed along with a new Lemo 3' cable.That way I can maintain the typical +/- 0.05dB flatness across the full range for all units. Occasionally I can get +/- 0.025dB flatness on a good build when the FR4, detectors and BNCs decide to play nice together.
BTW I now offer a complete SMA unit : SMA-Fem in with SMA Male output version as well.
Not that it works any better, given the tuning, but perhaps it's more convenient for some applications.
All built & calibrated versions (incl. cal. cert.) are available at $110 plus shipping ($7 economy = 4 to 6 weeks), UPS Express Saver = $65 (1 week tracked). Down to around parts for maybe 6 left.
They've gone globe trotting, Brazil, Finland, Canada, USA, Germany, Italy, Australia etc.