When I first put together my SPOA I ran 33x12.5 BFG MTR's on 15x8 wheels and 3.5" of offset. I didn't have to worry about rubbing on the spring due to having an SJ-410 and my springs sitting 1.5" further inboard on both sides compared to the Sammy while still running the Sammy axles (3" wider then stock).
We did cut out the rear fenderwell to deal with rusting so I had an extra inch or two of clerance in the back. In the front I just pounded the fenderwell back a little bit so the tires wouldn't rub when turning. I also put a second Number 2 spring in the front in order to help with the load of the winch and everything so my front springs would not be inverse like they are on a lot of SPOA rigs. This helps give you keep the tires out of fenders. I run a 6.5:1 T-Case with 5.12 gears with a 970cc 4 cyl (SJ-410, FTW) and a 4 speed. I can cruise at 50 but I am turning 5 grand to do it and can't really push much faster as I run out of gears.

My cousin has 33x12.5 Swamper SSR's on the same wheel with a straight SPOA and runs fine. Sadly no pictures easily available as our cameraman is never around when we take him on wheeling trips. He is running the 8:1 Transfer case gears, still says he is a bit short on power for running on the highway with a rebuilt 1.3.
I have run into three issues with the 33" tires and stock springs. First was mentioned by zukimoo with the axles. I would put braces on the top if you plan on doing any jumping (Sky Manufacturing has a nice set for a good deal
over here. The other is your axle shafts themselves. I would recommend switching the fronts over to Trail Tough Double Tough front axles, especially since they are still on sale
over here. If you look in the products section they even have rear ones available now.
The second issue both rigs have run into is rear spring wrap. One good day on the trail with some solid climbs and both your rear springs will be shot. A club member with YJ springs ran into the same issue. He installed a traction bar, I switched over to a 4 link after I destroyed my second set of rear springs. When I destroyed the first set I actually pealed the spring pads off of the axle. Not the welds, I ripped the tubing itself apart. Since then I have sleaved the entire rear axle with tubing to add some additional strength but a traction bar should be enough to avoid this problem.
For the traction bar I would look at the work khan_sultan did after his SPOA. You can read his lift write-up at
http://www.zukiworld.com/forum/index.php/topic,24682.0.html or go straight to the traction bar article at
http://www.zukiworld.com/forum/index.php/topic,25712.0.html I would recommend reading his posts for the pictures alone.

The third is toasting the transfer case mounts. Switch over to an unbreakable set or just pick up the Snatch from ZOR or one of the other mounts from the other suppliers. I beefed up my long t-case arm with a piece of angle iron and called it good. Eventually I destroyed my t-case cover dropping it on a rock and built a skid plate. But I did wheel for 3+ years with only the unbreakable t-case mounts from Rocky Road with added fender washers to keep the bolts from pulling into the poly bushings.
The fun thing with the Suzuki is their is no one way to build them. Let us know what ends up working for you.