Could anyone please help me with some info about electric guitars, and my guitar? I have two questions.

First, I'd like an authoritative definition of the terms hollowbody and semi-hollowbody, as applied to electric guitars. I found one site that indicated the semi-hollowbody has cutouts (f-holes) with air space, but a wood block under the strings, almost like an internal continuation of the neck to the butt end of the guitar. I haven't found a definition of hollowbody. Common sense tells me it's totally hollow inside--is that correct?

Second, I have a Guild SF4D and would like to know more about it. I would guess it was made ca. 1975-1980. It does have what appears to be a wood block running under the string course, so I believe it's a semi-hollowbody (but would like to be certain). I get no matches on a Google search. However, I did find a Guild Starfire IV, which looked virtually identical to mine. That made me wonder if SF4 was an equivalent name to Starfire IV, but gives me no clue as to what the D signifies. I'd like to know the history, reputation, and value of the SF4D.

Detail note: mine is a factory left-handed, custom-ordered with a master volume knob that was not normally installed. From the "mah." written on the label, I assume the body is mahogany.

Any help would be appreciated.