First, you 1991 Celica GT, based on how you described it, probably is not safe to be driven. And with the type of damage it has, it likely should not be repaired. I've owned six 5th Gen Celica's, and they are great cars, but they are not great enough to be driven in the condition of the one you have.
Second, I doubt front-end damage affects your trunk lid. 5th Gen Celica coupes & convertibles (assuming yours is a coupe or convertible) had a complicated set of trunk lid hinges that often had the pivoting links getting less capable of pivoting due to corrosion in the pivot joints. Those hinges needed to be lubricated with a silicone lubricant often to maintain proper operation. I'll bet you have not kept up with lubricating those hinges. You can get some silicon lubricant and try spraying that on all the areas where the trunk lid hinges have pivot joints and see if you can loosen them up. But if they are badly corroded, those hinges are probably beyond being saved.
Second, I doubt front-end damage affects your trunk lid. 5th Gen Celica coupes & convertibles (assuming yours is a coupe or convertible) had a complicated set of trunk lid hinges that often had the pivoting links getting less capable of pivoting due to corrosion in the pivot joints. Those hinges needed to be lubricated with a silicone lubricant often to maintain proper operation. I'll bet you have not kept up with lubricating those hinges. You can get some silicon lubricant and try spraying that on all the areas where the trunk lid hinges have pivot joints and see if you can loosen them up. But if they are badly corroded, those hinges are probably beyond being saved.
