Here is a rough build, you still need a CPU cooler and windows. I went over budget, but it's very close to find variations of a build that would work for you. Try follow this build as a guideline and post complete build on the forum to get reflection on it (but remember this one i put together with "rough" emphasized thats why i say to use it as guide). Im fairly certain that the i5-7600k will work with win7, you can also double check that. These components can easily be switched out for better priced ones
Intel Core i5-7600K 3.8-4.2 Ghz 4-core Kaby lake Processor × 1 ₱12,560.00
Asus Prime Z270-A × 1 ₱11,290.00
GSkill Ripjaws V 16GB Dual DDR4 3200 (F4-3200C16D-16GVKB) × 1 ₱6,290.00
MSI GTX 1070 Gaming Z Twin Frozr 6 8GB × 1 ₱26,750.00
Corsair CX750 750W 80Plus Bronze Power Supply × 1 ₱4,200.00
Corsair Carbide Series 200R Window Edition Casing × 1 ₱3,350.00
Subtotal ₱64,440.00
Shipping Pickup
Total ₱64,440.00