All of the above - as we need to visualise it into place !

You need to repost your question to the Using Houzz forum, and hopefully someone from houzz will answer it. The design forum is mostly people who aren't employed by houzz so the chances of anyone on here helping you are slim.

Unfortunately, our products are a bit out of your stated price range, but we would strongly recommend against buying any Chinese-made hood (Cavaliere, Euro-Kitchen, etc). The minor difference in price for an upgrade to at least an American brand (e.g. Broan), is well worth the difference in quality, reliability, and customer service. Consider this: range hoods need to be installed. Buying a cheap hood may cost you more in the long run, due to the expenses involved in troubleshooting, un-installing, and re-installing it. Not to mention that cut-rate hoods use cheap 400-series steel, which will discolor over time; unlike the higher-end hoods, whose AISI 304 stainless steel is truly stainless, and will look as good 10 years down the road as the day you bought it. We completely understand that budgets can only be stretched so far, and not everyone has the room for $ 1500+ European hoods, but we've heard way too many horror stories about cut-rate appliances, to ever recommend shooting for the bottom of the price range.

It is not up to you to decide on MUA that is decided by code in your area as for the size 600 BTU should be fine but as to the size of ducting that is decided by the BTUs of the fan and you have a long run I don’t know how many bends but IMO you will need to increase the size of your vent.