Fairly easy for me to build. I use single coils and have been running about 0.6ohm with 26g and 24g 2.4mm ID.
Only had a little bit of trouble the other day, but that's because it was the first time I used 24g.
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24ga, AKA "coat hanger"...LOL
The Derringer is a easy to build atty because it is a bit bigger...the Tobecco clone can be moddded to make a BF atty.
Right now Kanvape has the Tobecco Derringer for $14.95* and 20% off, free shipping until the 1st.!

Pretty sweet deal!
*The Paraxis original is like $75.00!