Build one ice at the bottom of the first straight away where they enter at, max that out. It should last until like 45-50 then youll have a load of money to place natures at the end of the lanes and just build them as needed.
the top one looks good but put an ice tower at the end of the first trail (look at mine) and dont put them on corners, the dont get a straight shot on anything there and it shoots faster straight shots.