youre gonna need a few things
tape(low tack)
liquid glue(tamiya,ambroid,ipc etc)
knife
styrene(up to you wether you want you want round or square, 0.5 size)
i forgot where i learned this from but havent seen anyone practice it. so i decided to bring it up again. im using my 66 nova as reference im not installing the grill but you obviously have to measure the old grill before you cut it out to have a exact flush fit i did that by taping the grill and tracing the size. usually ill lay the pre-cut design on the table on top of the blue tape for better accuracy but too lazy for that.
you start out by laying bars back to back then you start by taking every other bar ouy and move them up or down your choice. the last bar is your support bar.
this is what it should look like when its all said and done
i soak the grill in warm water after a hour unless you used a fast a glue.
this is what you should have, measure up, trim the edges and you should be good
im not mounting mine which is why you dont see the grill cut out
heres how it looked on my GTO lowrider