Yeah. The pillars and possibly under window and floor/steps will suffer from the water. As its already started it is important to deal with that ASAP. Flood it with lanolin or penetrol straight away and get it sorted soon as its a safety issue. Not much protecting you in the front and any loss of support compounds that situation. If its already been done and still an issue the insides will be pretty cactus. Have all the cavities along the roof and B pillars checked as well and treated if still sound enough. the a pillarand check part is definately a task for someone who has the tools and skills. have a go at the roof yourself if necessary. Dont be tempted to seal it with silicone .