Duct work placement
Hello and welcome Cylindersticks, to the best DIY'r site on the web.
RA size should be at least 110% of the supply in equivalent area. Combustion air should really come from the outside.
Zoning will be expensive either way you attack it, (dampers in ducting or dampers in branch runs), it will make things more comfortable, but the payback is just not there.
If you basement is subgrade and insulated, the amount of heat you will need is minimal by comparison to the upstairs, this being, there is far less heat loss/heat gain.
When its all said and done there is usually more said than done
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