Which state are you coming from? and which town? are there any swiftlet house(s) around the area yet?

Frankly speaking, it is impossible to build a swiftlet ranch with your budget. For example, to build a two storey building alone for swiftlet ranching at size of 25 x 75 feet will already cost you a hefty RM100k+ which doesn't include the planks (given each floor requires 1.5 ton of plank at about RM2.5k/ ton), equipment (audio systems, ventilation, alarm system & etc), consultation fee & etc. However, RM70k might be enough to renovate an existing three storey shoplot depending on what kind of equipment you want.

Hope this info does help you a little bit