looks good.
things to know about welding CM.
er70s-2 has not been the standard filler for it for years, tho people keep using it. use er80s-2 or s-6.
buy some temp-sticks and either preheat AND post heat all your joints to 300-400*F. normally you hear people talking about doing it only for over .120" thick wall. remember that the effective thickness in some welds will may make your welds beyond this thickness.
doesn't take long to tig-weld them, but it goes MUCH faster if you tack weld it with wire or stick. assuming you have an oxy-fuel torch, it takes very little time to pre-& post heat them. adds an extra two to each applicable weld.
ive read on the lincoln site some people use 310 or 312 filler. i wouldn't... can't find the mechanical properties anywhere online & that just adds one more type of rarely used filler to have laying around.