He 70 was a streamlined aircraft from the early 1930s. One of the 1st A/C with retractable U/C, as well as with wing without external supports/braces. RR exchanged 4 Kestrels for the He 70 so they can experiment with engine installations on high speed A/C, as we know RLM used Kestrels to power a host of prototypes in mid-30s that.
So - let's use the He 70 as base for full-blown military A/C, 1st by modifying some internal parts, made from Elektron, to use something less flamable. In Germany - make an actually useful dive bomber from He 70 (unlike the He 118)?