I should also add that using a 2N7002 rather than a 2N2222 would be worthy of a trial; that's what the popular ND6T design uses.
Once ready to destroy the new V5 kit just received, I plan to build the ND6T board in hand and have it's output applied to the KitsandParts preamp in place of an R7 & with an R6 of yet-to-be-determined value. The current trial on a V3 radio uses (as mentioned) a 100-ohm resistor just to keep from shorting out the preamp transistor direct to earth.
Ted