Here are a few things to keep in mind, depending on condition and how deep you want to take restoration:
1. The body is aluminum, which may require some welding.
2. The body frame is mostly wood, so some woodworking my be required.
3. Some parts are hard to get and must be procured from various parts of the world. This sounds expensive, but isn't nearly as bad as it sounds! The biggest issue is usually simply finding the right parts, and this site (as well as other Singer Club sites) is the place to begin the search.
4. If you are a stickler for the exact OEM right part, some minor parts are nonexistent and may have to be fabricated. Most of these parts have a suitable substitute which may not be an exact replacement. Some parts simply require patience to find.
5. If you need to restore chrome plating, this can be more expensive than expected!
As mentioned in a previous post, each part should be viewed as a mini project of it's own. Sometimes these projects migrate from a small project to a semi big deal. You just never know what you'll run into. Mini project after mini project, before you know it, the car will be going back together! The good news is that nothing is super complicated and can be accomplished with a certain amount of dedication and determination! My solution to this was simply committing to accomplish something on the car every day! Even if it's searching the internet for a part, or spending 10 minutes in the shop, it is one step closer to the finish line of a completely restored car! I'm not trying to scare you out of the project, but too many times, a well intended restoration project looses momentum resulting in a garage queen for the next generation to deal with. My 4AD restoration took me about 5 years to complete! Now that it's basically finished, the joy of showing and driving the car knowing the labor of love that was invested is priceless. Sort of like the Olympic athletes, the earned metal made all the crazy hard work worth it!!! To get an idea of the restoration process, you can check out the restorations photos on my 4AD restoration website at:
http://www.1952singer.weebly.com
Might you have some general photos of the car you can share with us?
Good luck and God bless!