Mosaic frames i have yet to attempt, a lot of work is involved in doing them because of the mono cam

Plus my FOV is smaller than yours, im currently running at .93 seconds of arc per pixel with the FOV about 55 x 38 ish minutes. Or to give you a idea of the size, i can fit the main portion of M42 in but the outer wisps are cut off.
SNR is what the 254 is good for at F4.7 it hurtles the photons down at a fast rate

Ill see how i go with time and where this object is placed so that i can have a start on it. Im feeling that this is a LRGB target only with long exposure times 15 even out to 20 min to really start capturing the flux.
Keep up the good work, 1 for the newt lovers