Yes, you can do a clean repair job and probably be close to weight. That is not a trivial repair however, and you have no access to the inside of the hull. To do it right costs $4k in materials and labor. Lets call it it $500 for material, leaving $3500 for labor. At $80/hr, that works out to a weeks work (44 hours) for a professional. I'd also be skeptical of the seams on that hull, and I would go ahead and tape those from the outside since it needs a bottom job anyway. Then you are still stuck with outdated boards.