OK, just to be sure it's the right material, I had to dig through the chaosgroup forum, as I knew someone asked me about that material. So, I'll post a link where I put some images, one with a print screen of the settings, one with the bump texture.But you have to schroll down 'cause it's king in the middle of the page. It's a reply for an user named 40'th. I dld your settings, but I didn't had time to test it, and I thought you will share the sketchup scene, not the visopt. Anyway, from your settings images, I didn't find anything that could ruin your rendering time. Even your reflective materials,they have default samples (8) and here I usually use 32. Your noise and color threshold is default (0,01) and here I use 0,005 most of the time. That being said, I don't know what's wrong, maybe some of the guru's will find time to help you. Sorry for this big "bla-bla", my English is not forte.
PS: you should try Teofas's visopt, see the attachment
Cheers,
Stefan

http://www.chaosgroup.com/forums/vbulletin/showthread.php?58309-Post-your-Simple-Render-here./page31

TEOFAS.rar

I use all the time brushed metal material, that come with v-ray. It doesn't render fast, but it's not obscene. I attached an image to see how it's rendered.
At this point, regarding the problems you're facing, I have a doubt that your glass it's ok.I mean, maybe the sun has so much trouble to bring the light inside through that glass. I would hide the glass, and see what's going on. As well, it would be good if you just upload the scene, and hopefully someone will have the time to test it.
By the way, do you have a deadline?
Good luck!
Stefan

http://luzindirecta.luxisessentia.com/index.php/vismat-pack-topmenu

Hi!
The only thing that caught my attention, is your irradiance map min and max rate. They are way off. Check this compressive guide:
@800x600
min/max = -4/1

@1600x1200 (doubled once)
min/max = -5/-2

@3200x2400 (double twice)
min/max = -6/-3

@6400x4800 (double 3 times)
min/max = -7/-4
There is a logical explanation about this, but it's just beyond me, so I stick with this guide.
Cheers!

Found this guy - Matthias Wandel - on youtube, as I was looking for home made CNC routers. He was building a milk box, and he was like a machine itself, but then, I noticed his gears and stuff. I followed the provided link and I found this site. I find it amazing, with plenty of articles and videos.
I apologias if this is already familiar, or it been already posted.
Regards,
Stefan

Forgot the link
http://woodgears.ca/

Julien, fantastic portfolio. Some refreshing images you got there.

This topic could help, I think: http://forums.sketchucation.com/viewtopic.php?f=322&t=34597

Enable physical camera.

Actually, I'm impressed by the modo output, and that's because I see ridiculously realistic output in Luxology's gallery, minus interiors renderings. Regarding Vray AA, it's not that, as Damian replied once, it's color beyond white (255 value), and as you can see, it appears only in bright areas as windows or whatever object has very reflective material applied. So, checking the "clamp output" and "sub-pixel mapping" should help.
Cheers!

Try first to disable "Refractive GI Caustics" under indirect illumination roll-out. Looks like caustic artifacts.
Cheers!

White paint with reflections, without loosing the details, how beautiful is this....
Thea is amazing, into the right hands! Congrats Master!

Junior,use this visopt. I know, it's not constructive, but, look at some settings, identify the major differences.
What I find amazing about it, is that there are no major tweaks comparing to the default settings. Most important it seams to be color mapping, and camera settings.
Cheers!

TEOFAS.rar

Hey, Professor, you're doing a great job, you have a beautiful soul, and we are lucky to have you!
Regards,
Stefan

Yeah....this is what we need..

I'll be following this, as I love australian architecture, BUT...that's not so steep, check this out, it could be worse:
http://www.dezeen.com/2011/07/25/holman-house-by-durbach-block-jaggers/

You're welcome, it was pure luck, I knew Nomer have in his blog some featured artists, and great tutorials, so I hit his blog first.
Cheers to Nomer!

Here it is
http://nomeradona.blogspot.com/2011/05/how-to-use-vray-channels-in-vray.html

love..

I did a quick search on google images for "rims"
And I got this:
I guess it's a two-spokes wheel, right?

Great model and rendering, Massimo! I made some "more vintage" looks for your awesome image. I hope you don't mind...
Regards,
Stefan