heh I made a map initially inspired by Temple for Action HL a while back. It's for HL1... and yours are for HL2... and... ummm... well I'll let the pics speak for themselves ;p
This is the HL1 version of the room shown in Cobra's pic:
This is the lower part of the central room. I added water so jumping down there would not be an issue:
http://www.cryotank.net/maps/temple/ahlt_lower.jpg
This is the huge, upper room. Quite a bit different in this case. I ended up redoing the layout a good bit as I went along, since imo the GE version had way too many empty corridors and rooms:
http://www.cryotank.net/maps/temple/ahlt_main.jpg
I know what you mean about liking the clean simplicity of the original Goldeneye map, and porting a simple map is a great way to learn. I think that for Source maps, though, both are painfully bland. I think it's better for go for "inspired by" with ports. Different games have different gameplay, and that means you need to make changes sometimes. Also, occasionally you will notice an older map simply has flaws in it that should be fixed. And why not give the map the visual makeover it deserves?
I made Basement as one of my first maps when I was learning Hammer/Worldcraft years ago. The first version was horrible, but I learned a lot making it. Then I went back and made a more playable version.... THEN I went back a third time and used the map to test certain eyecandy effects I was developing for Temple:
http://www.cryotank.net/maps/basement/index.html
Kinda wish I'd made a HLDM version of Temple... :/
I think a simple port like this is an excellent way to learn, but it's really not 'done' compared to a real Source map.