I find it difficult to make decisions on the hardware to use for the Inside F5J.
The suggested motor and speedcontroler (Hacker A20-22L EVO & Hacker X-40 SB PRO Regler) are together a hefty €140,- (approx, pending supplier).

Also, the suggested speedcontroler is a 40 Amp one,… this seems a bit big as the max suggested current is approximately 20 Amps.

As we are going to build the Inside F5J in winter time and negotiations with Höllein are in full progress (…), some time is available for research on the World Wide InterWeb.

Attached some links…