One of my domestic machines is in an old kitchen table I bought off a second hand furniture stall for £15. It had one drawer which was accessed from the table end..
We made a cardboard template of the footprint of my machine and its insert. Traced round the template on the table top using a sharpie marker then cut a hole in the top to recess my machine. The drawer runners were like a cradle and we put the off cut from the top on the drawer runners to support and raise my machines and its perspex insert flush with the table top. The table top had a rounded profile and rounded corners so the quilts or whatever I am sewing does not catch.
The drawer runner area has been left open underneath for easy access for the power cable, foot pedal and cleaning.
The table had been used as an artists table and bloke had polyurethaned it to a super high gloss to repel paint. Well, quilt tops and fabric slide just like an ice rink (I wish my handi-quilter table was the same!)
The only tools required - a hand-held electronic jigsaw and a drill with a spade drill bit. The spade drill bit shaped the rounded edges for the perspex insert.
I use elephant feet risers to make the table tall enough for me to sit comfortably.
Expenditure was minimal and it was simple enough for me to do by myself although I was able to rope a friend in to do it for me in exchange for a meal and a beer!