I said to myself when I first starting using the SCP builds that you guys put it, that I wouldn't congratulate you until I saw something that I considered a worthy upgrade.
Well I'm not wholely sure what changed between SCP 3.6 and this build 01082004_fs2_open_r.exe, but I'm impressed.
SCP has earned itself some recognition with me, which is rare for something like this .. (in most games, the modding community are all idiots, and I didn't really make much of an exception for this one, even if occasionally it threw out a couple decent missions).
Take it into context that you're the first mod group that I've ever actually said thanks to.
Anyway ... onto useful input

In playing that latest build after a clean install on a clean HD I came to realise that although much much better there's still a few major problems, some new(to me), some old.
First Off:
System Specs:
(CPU) 1-AMD Athlon™ XP 3000+, 2091MHz, 512KB (0% Load) @ 52°C .:.
(RAM) usage: 295/1024MB (28.81%) .:.
(GFX) RADEON 9600 (It's a Pro) SERIES - Secondary,
(Display) 1600x1200/32bit/85Hz
(OS) Windows XP Home Edition, Service Pack 1 (5.1 - 2600),
(installed for) 4w 5d 22h 28m,
(uptime) 6h 56m 7s .:.
(HDDs) 133GB/228GB(58.4%) free
Onto the SCP stuff:
Alt-Tabbing seems to be completely dead in this version, now, although I alt-tab less these days because of global hotkeys in mp3 players, I still tend to alt-tab especially when trying to arrange multiplayer games without the lobby atm..
Cross Hairs are still spliting, I realise the reason for this is that missiles travel at a different speed to primary shots therefore the two indicators are different, but it looks horrid...
Fire/Plasma Venting effects of damaged ships completely murder my FPS (!!! On My System?!). - This happened a little bit in FS2 Vanilla, but it's a major problem....anything that kills FPS is a major problem...
"Events" Such as speech, or ships that are supposed to come in, seem to be suspended whilst in an external camera view, I don't have a clue why.
The Tail of maximum thrust engines seems to have a problem in that it's not all transparent, some of it has little white lines on the very end that drags behind the ship, looks weird.
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My Final thing for now:
FRAME RATE!!!
I don't mind if my frame rate locks at 42 FPS.
I don't mind if it locks at 24 FPS.
I would like it to lock at 85 FPS.
Obviously, I have vsync on...
There seems to be a problem or two with model processing at close range:
Depending on the size of the ship, and, then, depending on the range from the ship, frame rates half or double as the load changes.
This shift from 85-42, or 42-26/23ish - it's unbarable, if you're dog fighting, your aim goes completely out the window, because you're suddenly turning too fast, or too slow, god knows how a joystick user feels, I'm used to making corrections for stuff like that (for other reasons ...being that keyboard is on or off), but it's the biggest complaint I have.
No matter what flags I turn on or off, it still seems to have this problem...
That's all for now, I might find some more input later...

Anyways:
Like I said when I opened:
I'm finally solidly impressed, the frame rate problems have dropped a bit and most / all of my other problems are gone.
These I flagged up as annoying or major problems in my oppinion.
...Feel free to flame me to high hell for how I worded this post

Edit-
FYI RAM Usage is up because FS2 doesn't appear to have returned all the memory it took on upon exit...