It won't be a kit, but it has been accepted for publication by QST for sometime in 2018. The circuit is about as simple as it gets:

Jack, W8TEE

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From: David Lacey via Groups.Io <g4jbe@...>
To: [email protected]
Sent: Friday, December 22, 2017 11:11 AM
Subject: Re: [BITX20] Dummy

Hi Jack
Very interested in the Wattmeter side of this project, do you have further information circuit diagram etc
on this item or maybe available as a kit??
Dave
G4JBE

On 22/12/2017 16:04, Jack Purdum via Groups.Io wrote:

Mike:

Or, how about 150W DL with builtin wattmeter for under $20? This was a build our group did a couple of months ago. The lid is shown here. The resistor network sits in a mineral oil bath. The downside is that this is considerably larger than yours and a little more expensive.

Jack, W8TEE