Absolutely necessary disclosure: I'm a beginner who does not have the skill (or hand planes!!!!!) to build a 3" thick bench top. I don't have the $400+ (including shipping) to buy a good one. So, I have an idea: get 4 oak stair treads at HD, cut them to size (my bench will be around 54x24) and glue them to a single layer of playwood of the same size.
Not having a table saw or miter saw, I want to leave a 5"-wide transversal groove some 12" from one of the ends in order to do quick cross cuts on 3/4 material with my circular saw / guide rail combo.
Total cost will be around $100.
Perhaps due due to my inexperience, I don't feel I need an absolutely flat bench top and it also seems to me these materials (oak stair tread plus plywood base) would provide a flat enough surface with the power to hold a few bench dogs.
is my plan realistic? Drawbacks? Alternatives? Shoot, please and be brutally honest. I'm here to learn.