Here's one where expertise in Sketchup would be good - a picture will easily be worth a thousand words .
I think he attaches the top to the sides simply using screws, so you could replace those with bolts and wing-nuts (or t-nuts countersunk into the top) to give you a removable top. It shouldn't (ha!) be too difficult to convert the side and back assemblies into a hinged gatefold affair. You'd need to fiddle the stock dimensions to give some clearance for the folding sides, I guess.
For something portable, you might be better with an alternative design. I've seen a couple that do away with any kind of leg assembly and instead use a brace across the underside of the table which simply clamps into your bench vice. I think Ralph Laughton did one like that a while ago in New Woodworking.
I think he attaches the top to the sides simply using screws, so you could replace those with bolts and wing-nuts (or t-nuts countersunk into the top) to give you a removable top. It shouldn't (ha!) be too difficult to convert the side and back assemblies into a hinged gatefold affair. You'd need to fiddle the stock dimensions to give some clearance for the folding sides, I guess.
For something portable, you might be better with an alternative design. I've seen a couple that do away with any kind of leg assembly and instead use a brace across the underside of the table which simply clamps into your bench vice. I think Ralph Laughton did one like that a while ago in New Woodworking.