Hardtail frame recommendations

[TeoElFeo]

I have this idea of building an e-trekking/touring bike and would like somebody to give me frame recommendations. The idea is to build a bike that has a great autonomy and is somewhat trail capable. I am thinking about going dual battery, with the second one being installed on the rack. Here are my main requirements for the frame:
Hardtail, m510/m600 compatible, rack mounts, preferably aluminium, boost spacing. I would like the total wh to be around 2000 to be able to do 200+km on a charge. Maybe somebody knows any suitable frame?

 

[Dave Rand]

I quite like the look of the Dengfu E14

 

[TeoElFeo]

Yes, I have seen it, but doesn't have rack mounts. Besides I'd rather stick to aluminium for this one...

 

[HIDrive]

Did you end up finding something you liked?

 

[TeoElFeo]

No, not really. I have put aside this idea for now

 

[El Topo]

Given all new gravel frames, for the Bafang M820, seem to be carbon, I am also considering an aluminium hardtail frame like @TeoElFeo, and I also need rack mounts.
Still can't find much if anything that would fit that bill. Ideally, it would have a geometry for short travel fork (to be replaced with a carbon fork), and a rather conservative geo, to make it work as a drop bar bike.

EDIT: Just found this one in another forum thread here:

Für Bafang Mid Mounted Motor m410 m500 m510 m600 em5 Aluminium legierung Mountain Electric Fahrrad rahmen Boost-148 29*2.35

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Geo only found here:

Hardtail frame for M510 (M500/M600) XC build

I am planning a Bafang M510 build with a hardtail frame, preferable 17" aluminum for 27.5" tires and combine it with a front suspension between 100mm to 120mm. It should be robust enough for trail riding with tiny jumps. I have found a few possible frames, but I am new to building a whole bike...

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