10） the builder‘s premises shall have the necessary facilities and equipment to construct the yacht to the agreed standards and specifications. the facilities and equipment will include shot blasting equipment， airless spray equipment， bolt welding capacitor， heavy duty pulse mig welding equipment and environmental monitoring equipment capable of providing a record of temperature， humidity and dew point.
article iv – modifications
1） at any time prior to delivery of the yacht the buyer through the buyers' representative may request， in writing， modifications or additions to or deletions from the design specifications and schedule a.
the builder shall not be obliged to accede to any request under this paragraph （1） unless：
i） it is reasonable and practicable for the builder to do so having regard to the stage of construction which the yacht has reached and to the builder‘s boatyard programme；
ii） the parties shall first agree in writing in relation to such modifications， additions， or deletions：
（1） any increase or decrease in the contract price and variation of the payment terms for the yacht；
（2） any extension of the contract delivery date；
（3） any alteration of the terms of this contract or the design specification or annex a.
provided that the builder shall be entitled to continue production in accordance with the design specifications and schedule a until agreement has been reached as provided in this sub-paragraph ii）。
2） the builder shall not make changes in constructional details or materials of the yacht without the agreement of the buyer in writing.
article v – price and terms of payment
the builder has agreed to complete the construction， outfit and delivery of the yacht for the buyer on the following terms.
1. the contract price for the yacht will be us$850，000 （eight hundred and fifty thousand us dollars）
2. payment of the firm price for the yacht， shall， subject to paragraph 3） hereof be made in instalments from the buyer to the builder as follows：
instalment event
a） initial deposit of us$127，500 （one hundred and twenty seven thousand five hundred） payable on the signing hereof.
b） upon arrival of all structural building materials in the boatyard， us$127，500 （one hundred and twenty seven thousand five hundred）
c） on satisfactory completion of the yacht‘s structural steel work us$127，500 （one hundred and twenty seven thousand five hundred）