open fire/back boiler

hi

i have an open fire in my siting room with a big(about a trailer and a half if not 2 of turf out side ) and iam thinking of putting a back boiler in to the open fire.

have a few questions

1.how much would it cost roughly

2.is it worth is

3.how much of a mess would it cause

4.am i mad to even consider it

thanks