A little bit ago someone posted here that they felt we were overbuilding our bench work.
My n scale benchwork was built using 1'X3"common white board with 2"x2" furring strips as legs...inexpensive, but you have to cherry pick your pieces in order to get straight pieces.
I let the lumber aclimate to the basement for 6 months...6 impatient months, then coated them with a floor grade poly that I mixed a 2 part walnut and one part cherry wood stain into. This was all material we had left after building our house (ourselves!) The stain and poly were left over from building a dual trestle table out of red oak for the dining room...good size, seats 14 with ease and weighs a ton!
I used Titebond wood glue and countersunk #8 2 inch wood screws to hold things together. The stringers were set 16"oc.
For the top, I used Dow solid poly insulation boards, 1 and 1/2 inch, and appropriate adhesive, let that cure for 48 hours.
The bench work is quite sturdy. I think our op on overbuilding may be on to something.