I have incubated a few Serama eggs (16 Serama and 9 Silkie Serama) in 2 different homemade incubators, but my success rates have been quite low.
The first incubator was not much of a success (it was a cardboard box with a light and fan, it didn't have a thermostat and relied on being monitored frequently) and only one of the 5 or so fertile Silkie Serama eggs survived to the pipping stage. That chick was too big fit in the egg so it couldn't move to get past the pipping stage. After 2 days of waiting I assisted by removing some shell but it was still unable to get out of the egg and soon died.
After having little success with the Silkie Seramas I have just been hatching Seramas instead, as the chicks are slightly smaller though the eggs are the same size. I also built a new incubator out of a polystyrene chest which has a semi-automatic turner, thermostat and fan (cost about $25). I have had 4 chicks hatch, including this one special needs chick, from a total of 7 fertile Serama eggs.
Of the 3 that died, one was (I believe) due to me forgetting to turn the eggs, one from an unfortunate accident (ornament fell off my shelf while the incubator was open) and the other due to the chick pipping the air sac too far down.