Dear Sri Narendra,
If the MS Angle poles with mesh costing you rs 61,600/_, as you said and if the above materials are of standard sizes, please go a head sir and I appreciate you for your skills.
Up to my experience a standard size of mesh it self costs you around a lakh of rs above for 2 acres and the required length will be around 1200 ft long and a height of 6 ft and above, which comes to around 7200 sq ft. Your calculation is rs 15,000/_. If it is correct, pl go a head with Ms structure and mesh of std sizes, as it is very much more secure than GI barbed wire.
In GI barbed wire fencing, Dogs, cats, fox and similar animals can not be controlled, where as in mesh fencing except snakes or small creatures, no problems with said animals. Hence, at the cost said by you ,MS flat poles with mesh is good.
With best wishes, g.p.Rao, farmer