Attiny-Duino or whatever?

Oh, there’s enough room to

Oh, there’s enough room to squize in a TO92 v-reg (about 250mA) on Lumi’s board. As for yours, you can make it smaller if you use a 2 layer board. It all depends on your needs. Of course, if you use SMD, you can make it smaller than a quarter. But anyway, both boards look nice, congrats both of you!