I am a long time lurker here and a first time poster! Woo! I am finally looking into building a nice bench for myself. I generally like to use hand tools whenever I possibly can in my work and as such am potentially looking at a Roubo design (any opinions about this design are welcome as well). I am a poor college student and cannot afford nice hardwood for a workbench. This will be my first real bench as I have not had space for one of my own before that didn't involve old doors and scrap. The moral of my story is that my local box has some lovely Douglas Fir 8 foot 4x6's for $12 a piece (there are 10 footers for $14 or $15 as well). With 6 of these I can have a ~20 inch wide bench at just over 5 inches thick, or 24ish inches wide with 7. Would these be a good a good option for a bench top/bench material or would I be better off with 2x material? Any input would be much appreciated!