Quick update,
here is the homemade stencil before etching.



And here is the soldered board after I fixed the minor issues. The TPS2044 has been bypassed.




The BOM for this one has been reduced to the following:

ref	value	Qty
C1	680pF	1
C2	0,01µF	1
C3	100µF	1
C4	0,1µF	1
C5	10µF	1
C6,C7	33pF	2
C8	4,7µF	1
C9,C10	1µF	2
C11	0,1µF	1
CON1	USB-MINI-B	1
D1,D2	4148	2
IC1	NE556	1
IC2,IC3	CP2102	2
J1	USB_2	1
P1,P2	CONN_8	2
R1	1k	1
R2	10k	1
R3	1,5k	1
R4..R11	27	8
R12..R15	15k	4
R16	2,2k	1
R17	15k	1
RV1	100k	1
U1,U2	SN75240	2
U3	TUSB2036	1
X1	6MHz	1

The definitive board will use one or two CP2108 to allow up to 4 or 8 hashing units.