Uh oh, I'd better make myself clear here; I was NOT suggesting modifying one of the original 930 versions, but giving a suggestion as to how one could easily add lighting to an inexpensive late model caboose.
Gotcha. I posted the link to the 930 on eBay so folks could see the way the light setup looked externally and that the railings were a match to the other "late" Gilbert offerings.
In the original post Rich mentions using a "die-cast" chassis, I'm pretty sure the die-cast chassis was only available on link coupler cars, though the sheet metal frame mounts in a similar manner and is readily common and affordable.
Depending on how deeply into the conversion of his 24610 Rich wants to go, I recall that the "standard" cupola style cabooses manufactured by Lionel could provide an easy conversion. The lighted versions use a twist-in lamp socket and the short railings and mounting system similar to the 24610. A couple variations even have the animated brakeman. I've seen several of these sell on eBay at bargain prices.