I updated source file for this module, so it supports MySensors 2.0 now and sends temperature data too. You can pick it at my github page. Total size for 'Arduino Pro or Pro Mini w/ ATmega328 (5V, 16 MHz)'
Program size: 13 396 bytes (used 44% of a 30 720 byte maximum) (2,78 secs)
Minimum Memory Usage: 614 bytes (30% of a 2048 byte maximum)

I bought here in Ukraine circular-shaped slow-blow fuses and soldered them almost normally (here is their datasheet http://www.rcscomponents.kiev.ua/datasheets/5rt.JPG), so far everything is ok.
And here is my board instance:

@Achim looks like a mistake in BOM (maybe that aliexpress listing has changed). Project uses same relay, but 5V version is needed.