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The AGC and PopFix kits are no longer being sold by Kees.
He had a run of nearly 1000 of each, and has moved on to other things.

But there still seems to be plenty of need for those boards.
Hopefully v5 of the uBitx will include these enhancements.

Kees left the schematics for those two boards in the K5BCQ directory of our files section,
? ??/g/BITX20/files/K5BCQ
but they are in an "emf" file type, which is some goofy MicroSoft thing.
I used a web utility to convert them to pdf's, since pdf's can be read on most anything.
Those pdf's are attached to this post.
Hopefully Kees will copy them to his K5BCQ directory.?

Kees also left gerber files in his directory, so if somebody wanted to build their own they could.
Should be possible to send them out to OSHPark here in Oregon, get boards in a few days.
However, I believe his gerbers are for lots and lots of boards in one big sheet, must be cut up by hand.
Perhaps new gerbers could be made for individual boards?

All the parts are quite common, easy to get on Mouser or Digikey.

Here's a list of parts, quantities are for both boards together, looks good but not verified:
Prices are around a $0.10 each for semiconductors, $0.05 for caps and resistors,? if buying 10 at a time.
Columns are:? quantity,? generic part number,? package,? Mouser part number.

2? 1N4148W? ? SOD-123? ??
1? MMBT3904? ?SOT-23? ??
5? 2N7002? ?SOT-23? ? ? ? ?
5? 10nF? ? ? ? 0805? ? ? ? ? ? ?
2? 100nF? ? ? 0805? ? ? ? ? ? ?
4? 1uF? ? ? ? 0805? ? ? ? ? ? ? ?
1? 1k? ? ? ? ? ?0805? ? ? ? ? ? ? ?
2? 10k? ? ? ? ?0805? ? ? ? ? ? ? ?
7? 100k? ? ? ?0805? ? ? ? ? ? ? ?
3? 330k? ? ? ?0805? ? ? ? ? ? ? ?
1? 1meg? ? ? 0805? ? ? ? ? ? ? ?

Again, this list has not been checked, but should be about right.
Part characteristics are not critical so long as you get the correct size part for the board Kees created gerbers for.

So long as you are paying shipping from Mouser, may as well get some other parts:
Maybe a dummy load using a bunch of? 283-510-RC? or 283-200-RC
And/Or build a diode RF probe using? ?621-1N5711W-F? ? or? ?511-1N5711

All of this stuff can be bought cheaper from shops in China, including board fab.
Instead of getting just the 0805 resistors needed, could get a kit of common values
for about $15, typically 30 each of 50 values.? Same with 0805 caps.
That 0805 device size is in imperial units,? so 0.080 inches long by 0.050 inches wide.
The 0805 parts fit well enough the bigger 1206 pads used by HFSignals.?

Jerry, KE7ER

As I recall, Kees was using EasyEDA.
They have an easy to use tool chain for schematics and gerbers.
Also a very reasonably priced fab service to build the boards.

Jerry

That list of part numbers is all surface mount, appropriate for?
the board design that Kees did.
My way of encouraging somebody else to take up producing the kits.

Here's the two threads relating to those kits.
? ??/g/BITX20/topic/18098324
? ??/g/BITX20/topic/22435274
Don, ND6T, came up with the circuit designs and built his by hand.
Kees, K5BCQ, did a board design, fabbed it, bought parts on reels,
and sent out nearly 1000 kits of each.

For a one-off, could fab the board using those gerbers from Kees.
But I'd probably just solder parts ugly style to a scrap of PC board,
or perhaps directly to the ground plane on the back of the Bitx40 or uBitx,?

All those parts are available in a through-hole version, if that's what you want.
The surface mount parts that Kees used are extremely small.
Could move up from 0805 to 1206 surface mount resistors and caps if not using Kees' gerbers.

Resistors and caps don't need special parts, 20% tolerance is fine.
I'd go for caps rated for 25 volts or more, though less should be sufficient.

Jerry, KE7ER