If you choose to conduct auto repairs on your Polini 911 GP4 Reverse then it will always be a good plan to have a Workshop Manual to use as a reference in the event that you need to know methods to remove a certain part much like the Door and fit it again in the correct way.
Polini 911 GP4 Reverse Workshop Manuals will provide you with particular diagnostic guidelines for the vehicle therefore if something is broken it can help you work out what the situation is and methods to correct it. Then you are able to decide if this can be achieved by yourself or that the job is just too big you can still book your 911 GP4 Reverse in to a suitable mechanic.
Polini 911 GP4 Reverse manual