Nga pala, if you can rent metal scaffolding, it would be a much cheaper (and sturdier) alternative to using cocolumber as concrete support. Not only is cocolumber getting expensive, you also have to buy nails and GI wire to secure them. This adds up to your cost, not to mention A LOT of used cocolumber afterwards.

If you want to rent, I can refer you to the hardware where I bought all my construction materials.