Rebuilding from a practical point of view is straightforward, and if done at base cost as I said is not expensive. I can think of two countries which frequently build in this way, from scratch, fit for purpose and attractive infrastructure (including essential public services such as water supply, electricity, transportation, telecommunications, and educational institutions) and finding out how it is funded, managed, how the teams work would be straightforward. As I said, building in this way, at base cost, is a tiny fraction of the cost of getting it done by property developers. You would need a Palestinian who is competent in terms of planning and managment to oversee it and again this would not be difficult either. You would need a pre-state framework so as to manage funding streams and this is far from insurmountable.
The problem is the geopolitical side of things. And this is where the international community would need to step up, to put pressure on so as to achieve the 2 state agreement, which will presumably be 50/50 split of land with fair distrubution of resources. This would be the problem area, requiring superbly competent negotiation skills, not the actual rebuilding.
To set out the geopolitical realities, in the last few months, attacks from both sides have continued, both condemed by the international community; Israel has signed off on 28000 new houses for Israelis in the West Bank against wishes of the international community. You now have the fragile situation with Iran which again needs to be re-set on a diplomatic and not military footing - because the situation with Lebanon, Iran, Palestine and Israel are all linked, I don't think can be separated. Very sophisticated international diplomacy is needed.