Naval element for the Spider army

A new element type for the Hordes of the Things (HotT) spider army, is a naval element. We plan on using the sort of mechanisms taken from the Hordes of the Empire (HoTE) adaptation to HotT (available on the HotT iOGroup). This one is based on one of the spider species that move around on water, on leaves etc 9see the reference in the illustration text below.

Source: https://mdc.mo.gov/discover-nature/field-guide/aquatic-spiders

Here is my interpretation of Mother Nature in this regard. 

It will cost 3AP (as per an Airboat) but be used per HoTE:

• Gunboats cost 3ap and play as either a gun, mortar, or a machine gun. May fire in its own bound even if it moved. Gunboats move 400 paces. Gunboats are on 80mm deep bases (15mm). 
• Transports cost 1ap and play as the type element they are carrying if they are carrying one. If not carrying an element they have a combat value of 0 and use the combat outcomes for Riders. Transports move 300 paces. Transports are on 60mm deep bases (15mm).
• Both Gunboats and Transports may carry one element. Their movement is limited to waterways. If in contact with the shore they may unload or load one element for the cost of 1 PIP. If a Gunboat and/or Transports are part of an army and a waterway is not placed on the board these elements cannot be used and do not count as elements lost .
• We have broken artillery down into 3 types - Guns, Mortars/rockets and Machine Guns. All 3 types use the artillery move rates, combat factors and combat outcomes. Guns: direct fire in their own bound if it did not move. Range of 8 inches. We are not distinguishing between type of gun, loading method or crew training. Mortars and Rockets: fire in their own bound if it did not move. Range of 5 inches and may fire over intervening terrain or elements. Machine Guns: fire every bound even if they moved. They have a range of 4 inches.