Very good ?
Drilling brassicas- obviously different timing. July 15- August 5 or so. While drilling, I'll assume 7.5" rows. 1/8-1/4" deep or so. I'd go lighter due to row planting. On a broadcast mix I may do around 3-4 lbs purp top turnips, 5 lbs radish. If I'm drilling, I'd bump down to 2-3 lbs ppt & 3-4 radish or even lower & I'd be very careful not to seed too heavy and I'd make sure u have plenty of N for brassicas. More so when drilling & if no til u need to spread before rain (24 hrs) or I'd prefer treating urea at coop for slower release & so doesn't evaporate.
The second one. U have the "right answer" and the "compromise". I'm gonna leave out compromise of "mid depth" because it might turn out like crap so I'm gonna tell u my opinion of "right way" no til. Oats, peas, rye, or big grain- .5" minimum, I do 3/4". Clover, radish, etc - 1/8-1/4" or so. So- the "right answer" is 2 passes. Ok- compromise - 1/3" maybe for example & one pass. I'd suggest taking time to do right though. Aug 22-sept 5 for example on timeframe.
Both need plenty N. Plenty p&k & proper ph. Brassicas will need clethodim & crop oil 2-3 weeks after germ if grass in it. (I spray same time I plant rye mix). Make sure both plots start of "fried" for weeds. Hope that covers it. Check ur furrows on depth every so often. Good luck!!