One thing to watch out for, especially with something like the Sugino RD cranks that use a 103mm bb, is that you will have clearance between the chainring and chainstay. On a lot of touring/commuter style frames the chainstays are made to accommodate wide tires and you may find that larger chainrings (44t and up) may rub on the stay. If the original cranks are still on the bike, heres the easy way to measure.
1. With calipers if you have them, or a good metric ruler if you don't, measure the distance from the middle of the middle ring to the closest part of the seat tube.
2. Add half of the diameter of the seat tube and you will have your current chainline.
3. Subtract 42 from your chainline to see how far off you are.
4. Now, measure the distance from the inner ring to the chainstay and see if you have more clearance than the number you got in part 3. If not, you'll have to live with an off chainline, or repeat the above with the outer ring to see if you can make that work.