The ARRL will send you a reprint of Doug Demaw's article for $5. I
have a copy of W1FBs Design Notebook and it looks like it has the
schematic and the description you are looking for. Sorry but I don't
have a scanner. You can often find this book at libraries.

The design uses 40673 dual gate FETS which are an obsolete part. You
can find them at surplus houses at about $10 each.

Any particular reason for wanting to build this particular receiver?

Roger