Some of the contracts run into 2020 so not all will be done in...

Some of the contracts run into 2020 so not all will be done in FY 19 (eg Origin, Sydney Water and Westside).

Below I guess at some numbers for the second half of FY19, with my assumption on the flagged improved gross margin on 18.8% last half:

Revenue     gross margin  gross profit    overheads     profit before tax       NPAT at 30% tax rate
$50 m            19.5%             $9.75 m           $7.5 m             $2.25 m                   $1.6 m
$60 m            19.5%             $11.7 m            $7.5 m             $4.2 m                    $2.94 m
$65 m            19.5%             $12.7 m            $7.5 m             $5.2 m                    $3.64 m

Adding in the FY 19 1H of NPAT $1.34 m and revenue of $47.5 m gives:
Revenue full year $ 97.5 m, NPAT $2.94 m with EPS 2.4
                             $107.5 m, NPAT $4.28 m with EPS 3.4
                             $ 112.5 m, NPAT $4.98 m with EPS 4
                                    EPS in 2018 was 3.7cps.

There are a lot of assumptions in the above, but that suggests we need revenue of $60-65 m in the second half to get around the same EPS as last year. Given some of the order book of $80 million runs into next year we presumably need more contracts to do that. The company expected "significantly" higher revenues and earnings in this half. I doubt revenue of $50 m in FY 19 2H fits that description, though with EPS at 2.4 it would justify the current share price with a PE of 10. EPS above that would justify a higher share price and seems to be implied by the company, but we will not find out what  happens for 6 months. The shares are probably a buy if my numbering is correct. If we can build the order book FY 20 would look very good if revenue was running at an annualised rate around $120 million in the second half of this year.