I will not be too helpful here because all of my fabrication contacts are here in the USA and, since I work with mostly commercial guys, their budgets are significantly greater than the 5-10K you mention as your budget.Im not totally against DIY but I am so busy with other things that if its something I could throw a bit of money at (scrubber, hood) and to have it delivered working, id be interested what options you would suggest.
But this forum is full of members who built their entire setups using DIY techniques and following instructions from threads on the forum. I am confident some of them will contribute here to get you past the construction phase.