Hi there, thanks for the comment! I don't make chairs although I get so many requests as the amount of work in making a custom set and the price would be too much for people to be interested for the most part - thousands !
The fumes with epoxies are no where near as bad as polyesters, although you have to be careful as mixing the epoxy causes a strong chemical reaction and it produces a lot of heat. It can actually self ignite and you can get fire before it has set.
Need a workshop yes indeed. Could do small projects without but the mess is high! Whatever epoxy sticks/drips and sets on is history haha :) I use a high power hammer drill to remove it from concrete - then it breaks the concrete before the epoxy usually!