You can build any kind of vehicle on old frames that can be considered classic for all sorts of brands and models. These could include frames for the street rod chassis, which can be custom built to fit any specification, whether for performance, shape or size. This is a thing which you should be able to access from all sorts of specialty shops for this thing.
A chassis for hot rodding or racing is something that is streamlined and low to the ground. This is to better have that ground hugging quality for great traction and stability when racing. So expect what used to be standard heights to go down to street level here.
Most folks will want to get this kind of thing with the complete set of features that may be available. This means that you could have everything laid on after the completion of the chassis undercarriage. This is the primary thing that is going to be needed by those who prefer having this kind of vehicle.
The vehicles that are in use are often used as things for hobbies in racing. Racers that are professional often need to have a better item than is normally available or used by enthusiasts. In any case a lot of experts are available for making this and many of them often have so many things that they can do for you.
But it might also depend on the budget you have and what kind of old model item you have. For instance, there might be some unique things which could be in use for a car from one specific manufacturer compared to the other. But all the necessary or vital parts are often there, just not in the same sizes or specs.
Performance level concerns will be further up the chassis but this base is something on which the engine block say rests on. This engine needs to have a lot of stability and support, and a well made frame is simply the thing needed here. You could actually have lots of options here, and you need to decide on these well.
All the things that could be put on could be classed as accessories since there are no standards that apply. Which means that you have the freedom to choose whatever works relevant to some principles or guidelines that may apply. Also, some formats in racing have their own regulations that you should follow.
You are able to have access to anything that could include work on this item being discussed. However not all shops or specialists can do everything that you may want. So it is best to prepare with some preliminary research on any company you have decided to contact.
That may mean going online and browsing, which is an easy and convenient way to build up your knowledge base. And knowledge is something that really works for you especially where the subject is concerned. You could also study all that has been done before and see how classics can be your thing or not.