Are the chainrings riveted together? That looks like the only hard part since you have all the rest of the components. Measure the chainline from the center of the bottom bracket shell to the chain ring you are going to use/keep. If it is close to 42-45mm you should be OK. Get a rear wheel with long enough axle and respace to the width of you rear dropouts plus keeping in mind what will give you a good chainline to match your front. If you are only going to make it a single speed then you can get away with it not being lined up perfectly more than if you are going fixed. Determine if you can do this before you remove the shifters and derailleurs.