We are on the scrounge again and need your help

A few years ago we built 4 large outside patios to give the dogs somewhere to have a little run around and get out of their kennels for an hour or two each week. These have been fabulous for the dogs but there are a couple of problems with them that really need sorting out.
Firstly, the dividing walls are not high enough and they have virtually destroyed the attached fencing. We have patched up the fencing with wood, metal etc, anything we had to hand. We want to remove this "mess" and raise the walls so they can't destroy them again.
Secondly, after raising the walls, we have a support for much needed roofs. There is no shade for them in the summer and they fight for every little bit of shadow to keep them cool.
Day to day running costs at the shelter are difficult to find so spending large amounts of money on this project is out of the question. In saying that, we still have to maintain the shelter, especially outside walls, otherwise we would have "escapees".
This is where you might be able to help.
Has anyone got any building materials left over from jobs. We need blocks, sand, cement, re-enforcing rods etc. Even if you have only got 10 or 12 blocks they will be of use to us.
We are not sure how we are going to do the roofs but anything you think we might be able to use i.e. corrugated sheets, roof panels, scaffolding poles etc. please let me know. Finally we will need exterior paint, ideally green and white but colour is irrelevant as it can always be used as undercoat.
If we can accumulate small amounts from lots of people it will keep our material costs down.
Initially we had planned on getting quotes from builders for all this work but I was hoping that we could cut down on labour costs by having a "work party". Maybe some volunteers could do part of this, or be labourers for a one man builder. It is quite a big job but not difficult.
We have had an offer of a weeks work from someone in Playa Blanca who is (young) retired and has time on his hands and I am sure there are some people out there who are "in between jobs" that could give us a day or two. We could work at the week end - time is not a problem - so if anyone has a free Saturday afternoon, Sunday or even week day, please get in touch.
We could get the ladies involved as well. Brushing up, fetching and carrying etc. We could even fire up the BBQ, get in a few beers and make a party out of it one Sunday
I need to collect names etc to find out if this is going to be possible, and when, so please call me on
646 838 749
and leave your details and availability
Many Thanks
Lynne