How to rebuild the filesystem of a recovered partition

I managed to ruin a server drive by trying to clone it to another drive with dd. In the process, the original boot and sda1 partitions were overwritten. I immediatly stopped using the drive,I made an image of the damaged drive with ddrescue then attempted to recover the lost partition with testdisk. Running a deepscan I found what seemed to resemble my lost sda1 partition so I restored. After running an fsck on it and sudo e2fsck -b block_number /dev/xxx to restore a uncorrupted superblock, I was able to mount the partition and found a lost+found directory containing almost all my files. It seems my files are there so how would I be able to recover/rebuild the filesystem of the original partition?