The kit is not urethane mainly because, it would not hold well and would be way too heavy. Urethane is basically like rubber, so the chemical properties are affected by weather conditions. During cold weather, the Urethane becomes brittle, and can break. Unfortunatly with Urethane, it cannot be repaired. During Hot weather, the Urethane becomes a lot more flexible, and can warp or lose shape. For small parts such as lip spoilers Urethane is great, for parts like fenders and bumpers, it's not always the best choice. There are positives and negatives to all materials.
For Veilside we feel that FRP is the best choice. If it is damaged it can be easily repaired by yourself, or by a body shop. It is light weight, and holds the shape very well. With anything there are various grades of fiberglass on the market. Cracking from normal use can be due to lower quality fiberglass, stress from an unproperly fitted part, or impact. Many of our customers use our kits on the road for daily driving and have not had any issues. I too have a car with full Veilside kit, including rear fenders. I have not had any issues from daily driving, or even the occasional curbing.
If your not familiar with VeilSide products, our reputation in the US has been built by customers and installers that were impressed with the quality and ease of installation. This kit, however will require more precise shops to install the parts, if they are misaligned on one part, it will throw off all the other parts. When designing the kit we use a 3D plotter to precisely measure each part to ensure that the gapping is even, the mirrored parts match exactly. Our tolerences are .5 mm. The holes on the bumpers are predrilled for precise fitment.
There would be no advantage to sell the parts individually, because they all require the next connecting part to mount. This is a wide body kit, so it will not match to the factory parts, nor will it match to other companie's body components.
10K-15K is not chump change by any means. We respect that the kit is not for everyone, however there are many parts to this kit, as every piece has been replaced with the exception of the roof and rear hatch.
The verticle doors on our car are prototype, we are waiting for the manufacturer to finish development for a bolt on kit, before we offer them for sale.