Edit the code with the models that you want to precache. Then put your models into the models folder.
Code:
/* Block models */
new const gszBlockModelDefault[] = "models/blockmaker/bm_block_default.mdl";
new const gszBlockModelPlatform[] = "models/blockmaker/bm_block_platform.mdl";
new const gszBlockModelBhop[] = "models/blockmaker/bm_block_bhop.mdl";
new const gszBlockModelDamage[] = "models/blockmaker/bm_block_damage.mdl";
new const gszBlockModelHealer[] = "models/blockmaker/bm_block_healer.mdl";
new const gszBlockModelInvincibility[] = "models/blockmaker/bm_block_invincibility.mdl";
new const gszBlockModelSpeedBoost[] = "models/blockmaker/bm_block_speedboost.mdl";
new const gszBlockModelNoFallDamage[] = "models/blockmaker/bm_block_nofalldamage.mdl";
new const gszBlockModelIce[] = "models/blockmaker/bm_block_ice.mdl";
new const gszBlockModelDeath[] = "models/blockmaker/bm_block_death.mdl";
new const gszBlockModelNuke[] = "models/blockmaker/bm_block_nuke.mdl";
new const gszBlockModelCamouflage[] = "models/blockmaker/bm_block_camouflage.mdl";
new const gszBlockModelLowGravity[] = "models/blockmaker/bm_block_lowgravity.mdl";
new const gszBlockModelFire[] = "models/blockmaker/bm_block_fire.mdl";
new const gszBlockModelRandom[] = "models/blockmaker/bm_block_random.mdl";
new const gszBlockModelSlap[] = "models/blockmaker/bm_block_slap.mdl";
new const gszBlockModelHoney[] = "models/blockmaker/bm_block_honey.mdl";
new const gszBlockModelBarrierCT[] = "models/blockmaker/bm_block_barrier_ct.mdl";
new const gszBlockModelBarrierT[] = "models/blockmaker/bm_block_barrier_t.mdl";
new const gszBlockModelBootsOfSpeed[] = "models/blockmaker/bm_block_bootsofspeed.mdl";
new const gszBlockModelNade[] = "models/blockmaker/bm_block_nade.mdl";
Then replace the model's name with the your model's name and then your set.